Archive of Our Own ^beta

Chapter Text

Dust:(continued from Chapter 2 of BwtS)

Sans continues to cling to Dust even after they’ve been gently placed on the bed. The Sin is warm and Sans’ skull is feeling so floaty he’s scared he’ll float away if he lets go of the only thing grounding him.

“I told them, but they demand lots of chocolate as compensation. Cross is a little bummed that he doesn’t get to join us but I promised we’d make it up to him next time.”

Sans purrs as Dust takes over petting his ears. He wonders if Dust’s ears are soft too?

Reaching out, he pushes back the Sins’ hood and begins gently petting the floppy appendages. They are soft! 

Dust gives a pleased little hum at the pets and leans into Sans’ hand. 

“If you two don’t stop being adorable I won’t be able to stop myself.~”

Sans whines as Dust stops petting, sending the other a pouty look.

“So don’t? We want it, what are you waiting for?”

Cheeks puffing up in irritation, Sans gives one of the ears he’s been petting a gentle tug in protest. He wants more pets!

Dust squeaks at the tug, turning back to Sans and retaliating by nipping at the smaller monster’s sensitive cervical vertebrae.

Whimpering at the unexpected pain, Sans leans up and gives the ear he tugged on a kitten lick in apology. He didn’t want to hurt Dust. The bunny-eared skeleton makes an odd rumbling sound that reminds Sans of a purr, but different. 

He’s distracted from the sound as Dust begins tugging off his t-shirt. Lifting his arms to help, Sans squeaks in surprise as he’s suddenly pinned with his arms trapped above his head.

Dust hovers over him, floppy ears brushing against Sans’ face as the other leans in close. He whines as a warm wet tongue begins licking at his neck and collarbone. He distantly notices that someone is tugging his shorts off, cool air blowing over his damp lips and thighs making him shiver.

“Stars, look at how wet he is. Wonder how many times we can get him to cum? Think he’ll beat Bunny’s record?”

Panting and whining, Sans wiggles beneath Dust as the other pulls away with another squeak. Over his shoulder Sans can see Killer who has a lewd grin on his face as he plays with something just out of sight.

The bigger Sin makes quick work of stripping Dust until finally the two smaller monsters are left bare and pressed chest to chest. Dust’s breasts aren’t as big as Sans’ but they’re wonderfully perky and the rest of his ecto is slim and soft in all the right places. With the clothes out of the way, Sans can now see that Killer has been playing with Dust’s puffy purple tail. 

A tug on his own tail has Sans arching up with a startled mewl, nipples rubbing against Dust’s with the movement making them both moan.

“They’re both soaked.~ Can I play with Sansy first? I haven’t gotten to play with those perky little tits yet.~”

“I don’t mind, just don’t push him into unconsciousness this time. We haven’t discussed how he feels about somnophilia yet and this’ll be easier if he’s awake.”

“Sir, yes sir!~”

Sans whines as Dust is suddenly taken away, arms reaching blindly in search of his lost companion. 

His hands are captured by Lust who pins them down on each side of his head, straddling Sans’ chubby belly with his hard magenta cock resting between his breasts.

“Hello Kitten~ I know you were having fun with Bunny but I’d like a chance to play with you too if that’s ok?~”

Sans stares up at the heated skeleton with blurry eyelights. He didn’t really understand everything the other had said but he knew that look. That was the look Lust got when he was asking for permission to do naughty things to Sans’ more than willing body.

With words being a bit too far out of reach, Sans mewls and cranes his skull a bit so he can lap up the bead of pre forming at the tip of Lust’s dick. Hopefully that’s enough of an answer for the bigger skeleton.

Lust’s gaze becomes sharp and almost predatory as he watches Sans give the tip of his dick little kitten licks. He adjusts a bit to pin Sans’ hands beneath his knees and uses his newly freed hands to gently cup his breasts, pressing them together around his cock.

“Such a beautiful body~ And housed within is an even more beautiful soul! Stars Kitten, in what world is it fair for you to be this gorgeous?~”

Sans whines and flushes at the compliments and the feeling of Lust slowly rocking his dick against his sternum. Those hot hands fondling and squeezing his sensitive tits feels so good and is sending little bolts of heat down to his pussy. 

Needing something to distract himself, he leans up a bit more and begins suckling at the tip of that hot length. Thick thighs clench together in an attempt to stimulate his aching core.

“Do you need something Sans? You’re squirming around so much down here.”

Sans moans around the dick in his mouth as cool tendrils wrap around his thighs and tug them apart. 

“So wet for us. Your poor pussy looks so empty, clenching down on nothing like that. Do you want me to fill it?”

Pulling back, Sans lets Lust pop out of his mouth and whines loudly. His legs are trembling in Nightmare’s firm grip and he desperately needs something inside of him.

“please ‘mare! want!”

It’s the most Sans has said since they started and he can feel the air around him grow heavy with lust as his words call to something deep inside the Sins’ souls.

A thin tendril rubs itself against his dribbling pussy, slicking itself up before slowly pushing in.

Moaning in relief, Sans uses his tongue to guide Lust back into his mouth, content to continue now that his own need is being cared for.

“So tight inside. I wonder if you can take more?”

Sans squeals in delight as the tendril bottoms out inside of him, pressing against the back of his magic as if searching for a way to get deeper. 

In answer to that push, he automatically forms a womb. The tendril gently presses against the newly formed entrance, before pulling back and almost all the way out.

Sans whines in protest at the empty feeling, already missing having it inside. But he needn’t have worried, as the tendril quickly thrusts back in. 

It still does not breach the special place Sans had made for it, but it does squirm and press against all of his good spots with each thrust.

Eyelights formed into barely recognizable hearts, Sans sucks hard on the tip of Lust’s dick. He loves the way the heated monster tastes, like mulled wine and something sweet and fruity. 

“Stars Kitten! I’m getting close.~ Are you going to drink it all pretty kitty?~ Or do you want me to paint that cute face of yours?~”

Humming, Sans presses closer in answer to the question. He wants more of that flavor on his tongue. He refuses to allow any of it to go to waste.

“Fuck! Heh~ here it comes sweetheart!”

Lust throws his head back and moans as he fills Sans’ mouth. The smaller skeleton happily gulping down the hot seed as spurt after spurt is emptied down his throat.

Once his orgasm has finally abated, Lust pulls out of Sans’ mouth allowing him to gasp for breath. His blue tongue painted purple and tears leaking from the corners of his sockets.

“Absolutely stunning~” Lust whispers reverently, using his thumb to wipe away a bit of cum that had dribbled down Sans’ chin. He chases after that thumb and licks the missed bit of release off it, not wanting to miss a single drop.

“Fuck Dust Bunny! You like it when I fuck you like this? When I treat you like an animal? Shit I’m going to breed your belly full of kits!~”

Skull tilting to the side, Sans watches as Killer leans over Dust’s smaller body and bites down on the back of his neck. The bigger Sin’s hips never slowing as he thrusts fast and deep into Dust’s pussy. 

The smaller Sin has violet tears streaming down his cheeks and his tongue is hanging out as he pants. Soft squeaks and moans escaping him as he struggles to push back against the dick inside of him, looking desperate for Killer to make good on his promise.

Killer catches him watching and sends him a feral grin. Sans shivers at the dark promise he can see in those empty sockets.

“I take it you’re ready for more? Well then, allow me.”

Sans yelps as he’s suddenly lifted up, Lust having disappeared at some point without him noticing. He’s soon lowered down to sit on Nightmare’s lap, whining as the tendril he’d been enjoying slips out of him.

“Hush now, I have something better for that hungry pussy of yours.”

The tendril that had been inside him hovers in front of Sans’ face, the end of it covered in blue slick. He flushes as it taps against his teeth, but obediently opens his mouth and begins to clean it with his tongue.

“Good boy. I didn’t even need to tell you.” Sans flushes brighter at Nightmare’s purred compliment, but smiles at the praise. He wants to be good for them.

Still licking the tendril, Sans is unprepared for the hands suddenly lifting his hips. 

His trill of confusion is quickly cut off by a breathless whine as he’s suddenly dropped onto something much thicker than the tendril that had once been inside him. 

He’s given no time to recover from the shock as those powerful hands drag him back up before slamming him down again, starting up a brutal pace that has him moaning and whimpering around the tendril in his mouth.

“So tight! But I know you can take more. Lust?”

Sans nearly screams in frustration as the monster below him stops and the tendril is pulled away. 

“Easy Kitten~” Sans whines at Lust, not willing to be placated just now. He wants more damnit!

“eek! lust!” He flinches forward into Nightmare’s chest as something cold is poured onto the puckered ring of magic below his pussy. 

“Sorry Sweetheart, I forgot to warm it up first.”

Sans sends the other a pouty glare over his shoulder. Bastard didn’t forget anything, he did that on purpose!

He buries his skull in the crook of Nightmare’s neck as hot fingers begin circling the tight ring. Slowly a single phalange is pushed inside making him mewl and squirm at the unusual feeling.

“I think it might be better if you prepare him Nighty. That way you can distract him by pounding that cute little pussy of his.~”

Nightmare’s ribcage vibrates beneath Sans as the bigger monster hums. A moment later the finger is removed and replaced by a thin tendril. It’s about the same width as the finger but it starts wiggling much deeper than the finger had been able to reach.

Focused on the squirming tendril, he doesn’t notice that he’s once again being lifted up. This time by thicker, vine-like tendrils that bind his knees and thighs together, keeping them spread wide.

“nightmare! fuck, please!” He screams as Nightmare uses his new wiggle room to fuck up into Sans’ fluttering entrance. His arms are grabbed and pinned behind him as his eyelights begin to roll back. His peak rapidly approaching.  

He gasps as the forgotten tendril in his ass begins thrusting in counter rhythm to the cock in his pussy. Squealing in delight as the tendril begins to gradually get thicker.

“w-wait, i’m gonna!” Sans leans forward as much as his binds allow and presses an open mouth kiss to Nightmare’s teeth as he’s pushed to his peak and then past it. The Sin eagerly returns the kiss, tentacle-like tongue easily dominating his smaller tongue and exploring his mouth even as it’s owner begins to slow his thrusts.

The tendril in his ass slips out with a loud pop , making him whine into the kiss in embarrassment. 

Embarrassment is quickly replaced by surprise as something else begins pressing against his loosened hole. Breaking the kiss, he looks over his shoulder just in time to see Lust’s (heh) lustful grin as he pushes in to the root with one smooth thrust.

A second peak washes over him as he clenches around the hot lengths filling him up. He lies limply on Nightmare’s chest as he shivers and whimpers in pleasure.

“Killer!”

Sans looks over, surprised by how shrill Dust’s voice has become but nearly cums a third time as he catches sight of his companion.

Dust’s skull is pressed into the pillows beneath him, arms pulled behind him and trapped in Killer’s grip as the bigger Sin pounds into his sloppy pussy. Sans can see the crimson of Killer’s cum shining through Dust’s swirling ecto as it fills his belly. 

“Cumming again Dust Bunny? How many times is that now? 6? 8? Ah well, I suppose it doesn’t matter.~”

Killer pulls completely out and Sans watches in amazement as the other’s dick begins swelling. Dust squeals as the enlarged member is thrust back into him, bones rattling as Killer immediately starts up a fast and rough pace.

“I’m not stopping till you tap out or pass out Dust Bunny! Gonna fuck you full of my cum and then I’ll hand you over to Lusty and the boss so they can have a turn fucking you up!~ Mmn, can feel another load cumming. You gonna take it Bunny? Gonna let me fill that slutty cunt of yours?”

Sans shivers and clenches down hard. He both loves and hates the way Killer gets when he’s like this. His words never fail to be embarrassing, but at the same time they fill his soul with fire and want.

“Killer! Fuck, yes, breed me if you can you bastard! Do it before I flip us over and do it myself!”

Dusts answering taunts have Killer snarling. He releases Dust’s hands and pushes them both down until he’s fucking the other into the mattress. Sans can see crimson cum escaping Dust’s pussy as Killer cums, but the bigger Sin doesn’t stop even as his partner screams himself hoarse.

“I swear, those two are going to break another bed if they continue like this. But nevermind them, I believe Sans here is ready for us to move now.”

Sans squeals as Nightmare thrusts up into his already stuffed pussy.

“I do believe you’re right Nighty~ lets see if we can get our sweet little kitten here to scream as loud as Bunny.~”

He moans as Lust pulls out a bit before slamming back in. The two Sins quickly setting a fast pace that never leaves him empty. One thrusting in as the other pulls out, over and over as they pound into his willing holes.

“oh fuck! nighty, lust, please! don’ stahp, fuckfuckfuck!” Sans screams as he cums again, clenching hard around the cocks still fucking him. He moans as he rapidly approaches another peak before he can even recover from the last.

Sans’ last coherent thought before succumbing to the mind numbing pleasure is that he hopes Cross and Error are able to keep Horror distracted, because he’s not sure there will be anything left of him if he has to handle the much bigger monster as well after this. 

Chapter Text

Meanwhile with Cross and Error:

Cross peeks into the kitchen and watches as Horror moves around his domain. The bigger Sin is busy preparing to make lunch and it’s his job to interrupt the gentle giant. Well, it’s up to him and his only ally in this.

Turning to Error, the two share a nervous look that does nothing to hide how excited they are. Their female ectobodies have already summoned in anticipation and Cross can feel his shorts growing damp with how wet he is.

“So how are we supposed to do this?” Cross asks, looking to the more experienced Sin for how to proceed.

Face lit up with his starry blush, Error looks around as his mind races. He spots two small aprons hanging from a hook just a few feet from where they were hiding. An idea begins to form and he uses a few strings to grab the aprons before ushering Cross back into the living room.

Cross feels his face growing brighter and brighter as Error explains his idea. Oh they are so fucked.

A few minutes later the two of them are standing together, completely nude but for the too small aprons just barely covering their breasts and pussies.

“I hate this idea” Cross grumbles, tugging down the apron in an attempt to cover himself better. The action backfires as it only reveals more of his chest. 

“ Shut up! Just follow my lead. ”

Whining softly, Cross follows the older Sin into the kitchen where Horror is busy washing some vegetables.

“ Hey Horror, want some help? ”

The bigger Sin turns and Cross shivers as that single red eyelight instantly becomes a heart before narrowing into a dangerous, predatory slit.

“W-what are you making?” 

Cross flushes even brighter as he feels trails of slick beginning to run down his thighs, Horror’s eye following them down before snapping back up.

“Hamburgers.”

Shivers run down the youngest Sin’s spine at the other’s low growl. Stars, he doesn’t know if he can do this.

“ We can help you with that, right Cross? Why don’t you help by going to get the meat while I help wash the vegetables? ”

Grateful for the guidance, Cross steps over to the fridge and begins looking for the meat. He doesn’t help in the kitchen too much unless they’re baking, but he thinks Horror prefers to keep the meat in the bottom drawer? Something about cross-contamination.

Bending over, forgetting momentarily about his current state of dress, he begins rifling around in search of the ground meat.

His only warning of his approaching doom is a loud snarl before suddenly his hips are being pulled back and his lips of his dripping peach are spread by the bulge in Horror’s shorts.

Whimpering, Cross holds onto the handle of the fridge for dear life as he’s rocked back against the bulge, the rough fabric of the other’s shorts creating beautiful friction against his swollen clit.

“H-Horror! Fuck please!”

He gasps as an arm is wrapped around his waist, keeping him pinned while the other moves up to pinch his nipples through the fabric of the apron. 

“ Why don’t we move this somewhere a little more comfortable, ey big guy? ”

Cross’s skull whirls as he’s picked up and pulled into a dominating kiss. He whimpers around the tongue invading his mouth and throat, struggling to return the kiss with his smaller lilac tongue.

By the time the bigger monster breaks the kiss, Cross’s head is swimming with lust and lack of oxygen.

He’s laid down on a familiar bed and trembles as he remembers what had been done to him the last time he was here.

“Little slut. So needy.”

He throws his head back and screams as that beautiful tongue plunges into his pussy. The thick muscle seeks out all his good spots, pressing and rubbing against them mercilessly.

“Horror! Fuck, yes, please!”

Tears escape the corners of his sockets as the other tears him apart, leaving nothing but need.

“ Noisy little bitch, aren’t you? Let's see if I can’t shut you up for a bit. ”

Cross opens his eyes just in time to see Error swinging his leg over him, his beautiful blue lips hovering above Cross’s mouth.

The younger wastes no time as he begins running his tongue over the sensitive folds, before slipping into that clenching entrance. His hands move up to grip Error’s round ass, pulling him closer as he searches for that special spot.

“ F-fuck! Crossy! ”

Finding the wrinkled flesh of his g-spot, he focuses his attention there as he desperately tries to hold back his oncoming orgasm.

Horror snarls against his cunt, claws digging into corded thighs.

Cross screams as the added pain pushes him over the ledge he’d been clinging to, cumming hard into the bigger monster’s awaiting mouth. His thick red tongue plunging deep as he drinks up the smaller Sin’s sweet release.

“ C-cumming! ”

The vibrations from Cross’s screaming and his talented tongue has Error reaching his peak much sooner than he’d anticipated. Glistening blue tongues hanging from his mouth, he rides out his orgasm.

Cross helps him through it with gentle licks even as he’s driven insane by Horror’s tongue still plunging into his over-sensitive magic. 

Coming down from his high, Error slips off Cross’s skull and flops down. With his mouth empty, there’s nothing to quiet Cross’s whines as trembles in Horror’s grasp, the pain of overstimulation only taking him higher as his hands fist the blankets beneath him.

Error hums and crawls down past where Cross is being tongue-fucked and palms the throbbing member still hidden by Horror’s shorts.

“ I feel so empty Horror. Won’t you fill me up? ”

Cross shivers as the bigger monster snarls against his lips again, whining as the other’s tongue finally slips out of him. Bones rattling and mind foggy, he doesn’t fight the strings that wrap around him. Tugging his arms above his head and tying them to the headboard and his knees to his chest, leaving him spread open.

“ Mmm, don’t worry Crossy. I won’t leave you empty for long.~ ”

Lifting his head from the pillows that had been tucked beneath him, Cross sees Error’s tongues hovering over his still twitching pussy. Behind him is Horror, shorts torn away and hand around his cock as he watches them hungrily. 

“W-wait, Err- Ah! Oh stars please!” He screams as two tongues are immediately pushed inside him, two more lapping at his sensitive folds, while the final one teases his clit. Thrashing in his bonds, Cross can’t tell if he’s trying to escape the pleasure or get closer to it. His skull feels like it’s been stuffed with cotton and he can do nothing but scream as he cums again. 

There’s a brief pause as Horror lines up with Error’s soaked cunt, before burying himself to the root with a sharp snap of his hips.

Error’s scream changes pitch wildly as his eyes are filled with errors at the sudden intrusion. He goes limp as he cums around the massive cock inside him, shuddering from the pain of it invading his womb. Fuck, maybe he should have made Cross go first?

Before he can even think of proposing they switch, the length is being pulled out and drawing a low whine from the glitching skeleton.

“Needy sluts, gonna stuff you full.”

Error screams as Horror slams back in, starting a brutal pace that has the elder flailing. His tongues still buried inside Cross writhe and flail, throwing the overstimulated Sin into another orgasm before he can even begin to recover from the last.

Arms wrapped around Cross’s thighs, Error struggles to hold on to what little sanity he had left. Each thrust went deep, pushing past his cervix and invading his womb before pulling back, leaving him feeling empty. 

Desperate to hold on, he focuses back on Cross. He forces four of his tongues into the younger Sin’s fluttering entrance, stretching him wide even as the tongue still on his clit wraps around the little nub and tugs .

Cross feels consciousness beginning to slip through his fingers as he’s brought to the edge over and over again. He fights weakly against his bindings as he sobs. It hurts, but it also feels so good! He can’t take it!

“Gonna knot you little slut. Fill your belly with my seed.” Horror growls, leaning over the smaller monster and biting down on his shoulder as he pulls the other back onto his growing knot.

“ Oh fuck, Horror! Yes! Knot me, fill me up, I want it! ”

Error draws away from the semi-conscious Cross, throwing his skull back as he cums.

With a lewd pop, Horror’s knot enters the glitch’s battered cunt, drawing out his orgasm. The bigger monster grunts as fluttering walls massage his dick, the tip of his length buried deep within Error’s womb. 

Releasing his jaws, Horror laps at the wound with a pleased purr as he cums.

Error moans weakly as his belly is filled with heat, walls fluttering and clenching around the cock inside him, trying to milk as much out of his mate as he can. He whimpers as his womb swells with the release, his already plush stomach bulging as he’s filled.

The flow seems to last forever. Each time Error thought it to be over, the bigger monster would begin rubbing his clit until he cums around him, prolonging his orgasm.

By the time Horror finally pulls out and stuffs a large plug into his mate’s wrecked pussy, Error looks like he swallowed a beach ball. He ecto aches from the sudden stretch and his bones rattle with pleasure as he rolls off Cross, cradling his swollen belly with a satisfied smile on his face.

“ Thank you mate, I’m so full now. But look at poor Crossy. He’s still empty and he can hold so much more than I, won’t you fill him up too? ” Error purrs, knowing his plan had worked as soon as Horror’s eye licks onto Cross’s stirring, tied up form. He teleports up into the nest in the corner of the room as soon as the bigger monster begins to move. From his vantage point, he can see everything as Horror begins sucking Cross’s nipples and testing his pussy with a few fingers to be sure the other is ready.

“Hmm? Wh-what’s? AH!” Cross screams as he’s suddenly filled to the brim, clenching down around the length as he begins once again wriggling in his bonds.

“Gonna fill you up Crossy. Won’t stop ‘til I have nothing left to give you.”

“H-Horror!” Cross whimpers, looking between them and seeing the dark red length through his light purple ecto. He already feels so full, but Horror promised more! 

“Please! Want you, wanna be full! Love you!”

Horror purrs as Cross looks up at him with fuzzy, heart shaped eyelights. He could tell that the other had slipped into that special state of mind where the world became soft and warm. With the others, they had to be careful not to hurt their sub when he was in this state, but for Horror? Horror knew exactly what the little Sin needed.

Still purring loudly, Horror begins rocking in and out of his mate’s pussy. He was too sensitive for their normal pace, but Horror didn’t mind going slow for a change. It gave him the opportunity to watch as his lover slowly lost his mind to the pleasure.

He leans down and laps at his breasts, nibbling gently on his nipples as his hands pet trembling thighs.

“Shh, I have you mate. Love you, will give you what you need.”

Cross whines, no longer fighting his restraints as he gives himself over to his bigger mate. He trusted all of his mates completely, but with Horror he knew he wouldn’t be asked to beg for what he needs. Horror knew what he needed, what he desired. 

In the hidden corners of his soul, Cross desperately craved to be a mother. His mates knew this, but they also knew their youngest member wasn’t ready. It’s why his mates teased about impregnating their lovers, knowing that it drives him wild with lust and desire.

Horror thinks, as his knot slips into his smaller lover and he begins to fill his womb with his seed, that perhaps they would be able to grant their fellow Sin’s desire soon.

Horror could feel that their little summoner had a similar desire as Cross, but it also filled him with fear. He hoped that one day their Jelly Bean would trust them enough to share his fears with them. Perhaps if they can banish those fears, then both of his precious mates could finally have their wish come true. He knows he’d be more than happy to help breed them when that time finally came.

Chapter Text

Sans and Cross knelt on the bed facing one another. Their hands bound behind them by Nightmare’s tendrils after they’d both been stripped bare. Their magic already swirling in their pelvises in anticipation as they waited for the twins to finish undressing themselves.

“Do you both remember the safe word?”

The two subs nodded.

“Blue.”

“blue.”

“Good, now Dream and I have only ever done this to each other so let us know if anything hurts alright?”

They nod again, the magic in their pelvises growing thicker as they shiver in excitement.

“Our seeds won’t take without the proper intent so no need to worry. You two can just let go and enjoy your punishment like our good little pets.~”

Sans whimpers, magic snapping into place as Dream purrs into his ear. His breasts heaving as he pants and wiggles, desperately trying to get some kind of stimulation. 

A soft whine from Cross tells him that he’d been just as affected by Dream’s dirty talk as Sans was. 

“You mean our naughty little pets, right brother?” Nightmare purrs, more tendrils sliding across their sensitive ecto-flesh and making them shiver. 

“Perhaps, but maybe we were too hasty in our assumptions Night. Perhaps our pets were merely trying to catch our attention? To let us know that they’re ready to be seeded. Ready to be stuffed full of our young, to be bred .” 

This time they both whimper, unconsciously bending forward to reveal their slick mounds, hot breath shared between them.

“Please! Please give us your seeds!” Cross whines, arching his back and presenting himself further.

“Such a cute puppy!~ Don’t worry pet, you’ll be nice and full once we’re done here.~” Dream purrs, moving around to be behind Cross, strong hands gripping the younger Sin’s hips tightly.

“And what about you kitten? Do you want our seeds as well? Do you want us to fuck your pretty pussy and fill your womb with our young?~”

Sans whines loudly, eyelights rolling back as he shudders with completion. The twin’s words and an errant tendril brushing past his clit had been all it took to send him over the edge.

Panting, Sans opens his eyes again and sees that Cross and Dream are now staring at him with hearts in their eyes. 

“please!” 

Control snapping, Nightmare grabs Sans’ hips and bottoms out inside of him with one thrust.

“FUCK! yes! please nighty!” Sans screams, falling forward into Cross’s chest as Nightmare starts fucking him at a brutal pace. Each thrust ending with the tip of his cock slamming against the opening of his womb.

“Dream!” 

Nightmare tugs him back by his arms, giving him a front row seat to watch as Dream’s golden length bulges out Cross’s flat belly with each deep thrust. 

Lilac tears stream down Cross’s cheeks, eyelights shaped into fuzzy hearts as he loses himself in the pleasure. Tongue lolling out as he moans and whimpers between panted breaths. 

Sans leans forward and tangles his azure tongue with Cross’s lilac. Cross moans into the kiss, drool dripping down their chins as they cling to each other in the only way they can.

“Such good pets.~ Being so good for us!~” Dream coos before leaning forward and biting down hard on Cross’s shoulder.

“Fuck! Please, please do that again! Mark me!” Cross begs, breaking the kiss to look over his shoulder at Dream with pleading eyelights.

“Such a good puppy.~ You want the world to see who you belong to? You want us to mark you up as we fill your belly with pups?”

Cross whimpers as Dream bites him again, the jolt of pain sending him over the edge as he squirts lilac magic around Dream’s cock.

“Do you want marks as well kitten? I can be gentle.”

Sans whines with uncertainty. He knew Cross and some of the others really loved biting, but something about seeing their magic leaking from the wounds scared him. 

“not too hard?” 

Nightmare slows his pace, pressing his chest flush with Sans’ back as he nuzzles the smaller monster.

“Of course my dear.” He purrs, before gently biting down on Sans’ shoulder. Sharp canines bruising the sensitive bone but not puncturing it.

Sans trembles at the pain, a tendril playing with his clit and breasts made it a pleasure pain but a part of him was still scared to look, sure that he’d see his magic and marrow running down his chest like, like . . . 

“Shh, I have you my precious soul. Nightmare has you. Just focus on me my dear.”

Sans relaxes as he’s drawn away from the flashback by his mate’s soothing voice. A glance over reveals that no magic is dripping from his shoulder, only a nicely darkening bruise that would fade with time.

“i’m ok. i don’t think i like biting nighty.” He confesses, unconsciously rocking back onto the member still buried inside him, the pleasure helping ground him in the present.

“That’s fine my love. Do you still wish to continue? We can stop here if you want?”

Sans shakes his skull frantically, pushing back harder onto the cock, trying to get it to slip past the barrier of his womb.

“no! please nighty! i want your seeds, i wanna be full!” He whines, looking over his shoulder with teary sockets.

Nightmare shudders hard as he’s hit by the wave of lust and need emanating from his smallest mate. Turning them away from Cross and Dream, he releases Sans’ hands and pushes him down.

“Such a beautiful, precious, wonderful kitten!~ We shall fill you so much that you and our mate will not be able to walk for a week! Your pretty ecto won’t be able to dissipate with our seeds inside you.~ Your needy pussy on display as we all take turns fertilizing the seeds with our cum!~ Round with our young as we worship you both.”

Sans’ eyelights roll back as Nightmare’s cock begins to grow thicker and longer, the tip finally breaching his womb as the base of his cock grows even thicker. The new thickness moves down his cock with each thrust, rubbing against Sans’ sensitive walls as it travels deeper.

“We will fill you again and again until we have nothing left!~”

“Dream!”

Sans peeks over his shoulder just in time to see the first golden seed pop into Cross’s stomach. The seed is the size of a golf ball and shimmers from behind the Sin’s lilac ecto.

“Take it!”

Sans screams as the first of Nightmare’s seeds pops past the entrance of his womb, a unique feeling of fullness accompanying the intrusion. 

“How many do you think they can take brother?” Dreams asks as he continues thrusting deeply into Cross, the tip of his dick never leaving his womb as he gradually fills him with his seeds.

“Hm, well if I’m remembering correctly we typically deposit five or six seeds at a time. I believe I have enough in me for two or three more rounds, how about you?”

They ignore the whimpers coming from their subs as they talk, the two lost in a sea of pleasure as seed after seed is deposited into their bellies. 

“I should have enough magic for three. So we can seed them both twice? Which would be twenty to twenty-four seeds for each of them.”

As the third seed settles inside his womb, having cum twice already just from them entering, he wonders if he or Cross will even be sane by the time they’re done.

“dream! no more! too full, gonna break me!” Sans whines, fingers intertwined with Cross’s as they once again face each other on their knees. Though this time their swollen bellies keep them from being able to kiss as they’re fucked and seeded.

“Hush Bluebell~ Just a few more and then we’ll be done. You’ve been so good for us.” Dream coos, nibbling lightly at Sans’ neck as he thrusts as deeply as he can, the many seeds inhabiting Sans’ womb creating an interesting pressure around the tip of his dick.

“Our wonderful pets!~ Soon we’ll have you both nice and clean and then we can go show the others how good you’ve been!~” 

Cross shudders hard as Nightmare bites the back of his neck, adding to the myriad of bruises and bitemarks littering his bones and flesh. Thrusting harder than his twin, but just as deep. He knows his mate can handle the rough pace, that it’s just what he needs as he peaks once more, clenching down on his cock as slick drips down their thighs, painting them both lilac.

The two subs rest their foreheads against each other’s as they give in and accept the last few seeds the twins have to offer. Both of them shaking with overstimulation and exhaustion as their ecto strains to keep their burden inside.

“I believe I only have two more left brother.”

Nightmare grunts in agreement, beads of cyan sweat mixing with the dark goop covering his bones. 

Moving together as only twins can, they both pick up the pace. Slamming into their screaming partners as they force the last of their seeds into their awaiting wombs. But even once the last few seeds are in, they continue their brutal pace in search of their own peaks.

“Our precious pets!~”

“So beautiful! Full of our young and glowing with pleasure!”

“A little more!~ We must seal our seeds inside your greedy wombs.~”

“You’ll carry a part of us around with you until your magic accepts our seeds!~ Days!~”

“Weeks!~”

“ OURS!~ ”

Sans feels the world darkening around him as he’s filled with Dream’s burning hot release. Golden fluid filling all the cracks between the seeds inside of him, so much that it surely can’t fit! But before any of it can escape, Dream pulls out of his womb and paints his entrance with more release. This time sealing everything inside so none of their seeds can escape.

A glance down reveals their swollen bellies, golden and black seeds clear even through the gold and cyan cum of their lovers. 

They shudder as the twins pull out, falling limply to the side as they cling to one another. Slumber stealing them away leaving contented smiles on their faces as they cradle their stomachs together.

“Dream?”

“Yes brother?”

“How are we meant to dress them? None of their clothing will fit over their stomachs and I know they won’t be willing to wander the house bare chested when they have their breasts summoned.”

Dream blinks a bit, expression quickly sinking into one of thought and mild regret.

“Perhaps Lust can make them something? Before they wake up? Some of Sans’ dresses should still fit and I know Lust has made Cross dresses as well though he refuses to wear them.”

“I suppose. I’ll go get them clean while you make the bed, then we can go ask Lust if he’s up to making some ‘maternity’ clothing for our precious pets.”

Chapter Text

Closing the door behind him, Blue turns to his guests/guinea pigs for the evening. 

“So! After browsing a bit online I was approached by a toy company who asked if I would be willing to test some of the toys they’ve made to see if they’re worth selling. I had planned to invite the others to help but I believe they’re currently more interested in wrecking Sans. Do you still want to help me? I can keep track of how we rate each toy so I can send the feedback to the company. All you need to do is try them out and let me know what you think!”

“Sounds fun Bluebird!~ Where do we begin?” 

Blue rubs his chin with a hum, going over to his closet to pull out a medium sized box. 

“Well I’ve already taken the liberty of taking them out of their various packaging and cleaning them along with putting in batteries if required. I’d like it if we can all try each item at least once so they can get a better idea of how others will like them. I guess we should start by stripping and summoning our ecto, then we each can pick a toy to try!”

Bouncing excitedly, Blue sets the box down on the trunk at the foot of his bed. In no time he’s stripped out of his clothes and summoned his full ectobody. A layer of muscle covering his body with just a hint of a belly, his breasts were small but his ass was big and round, perfect for slapping.

Following the Fury’s lead, Lust simply snaps away his own clothes, sending them to the hamper in the laundry room. His magenta ecto practically glowing in the dim lighting of the room as he stretched and showed off his lithe form. Breasts just the right size to cup in one hand leading down a flat belly to his throbbing member and dripping peach.

Looking over his friends’ bodies, Dream can’t help but feel a little embarrassed. He knew his own body wasn’t nearly as filled out as theirs, only the slightest swell of breasts and an ass. His brother had been the one to inherit all the curves when they’d been created, not Dream.

Sensing his fellow Fury’s discomfort, Blue moved over to stand behind him. Hands coming up to grope his chest and flick his stiff nipples as he caught Lust’s eye and nodded to his companion’s pussy.

“B-Blue! You know I’m sensitive there!” Dream squeaks, arms hovering at his sides, unsure of where to put them.

“I know!~” Blue replies in a sing-song tone, not stopping in his actions as he admires his friend’s beautiful golden ecto.

“Hm~ I wonder where else you’re sensitive?~” Lusts purrs, surprising Dream as he grabs his thighs and tugs him forward onto Lust’s awaiting tongue. 

Moaning, Dream begins to relax into their embrace. No longer feeling self conscious as he takes in their desire to comfort him as well as a bit of sympathy. Everyone had moments where they felt a bit ashamed of their bodies. Blue was the one who had taught him that a good way to help with that was to turn his body into a vessel of pleasure. After all, it’s a bit hard to feel self conscious when you’re focused on not cumming too quickly.

“Ok, I get it. Thank you, but I believe we came here for a different reason?”

“Too true! Do you want to pick the first toy Dream?”

Pulling away from Dream’s now dripping folds, Lust licks his teeth with a pleased hum.

“It’s always a pleasure darling, you taste delicious.~”

Blushing, Dream smiles down at the Sin before scooting a bit closer to the bed and peeking into the box. Inside was a myriad of toys, everything from vibrators to an enormous dildo to nipple clamps. Curious, he grabs two little suction cup looking things from the box and begins squishing them between his fingers.

“Ooh, good choice! Here, let me help you put them on!” 

Handing them over to Blue, Dream watches as he applies a little lube around the rims of the suckers before skipping back over. Where had the lube come from? Dream didn’t see any in the box or around the room.

“Ok, just hold still!”

Doing as commanded, Dream’s breath hitches as the first toy is held up to his stiff nipple. Moaning softly at the pinch and tugging sensation, Dream watches eagerly as Blue applies the other.

“You already have sensitive nipples so I’m curious to see how you like these nipple suckers.”

“They feel good. How long am I supposed to leave them on?” Dream asks breathily.

“I think the box said about fifteen to twenty minutes for maximum effect? But you can always leave them on longer if you want. Or take them off sooner if they become uncomfortable.”

“That looks nice, can I go next?” Lust asks, getting to his feet and gently flicking one of the suckers, earning himself a deep groan.

“Sure!” 

Hips swaying seductively, Lust bends over to browse through the toys. Finally he settles on something he’s never seen before. It’s a long wand-like toy with two little metal prongs at the tip and a button on the handle.

“What’s this?”

Bouncing over, Blue eagerly takes the wand from his hands and gestures for him to sit down on the edge of the bed beside Dream. The other Fury having begun rubbing circles around his clit with one hand while occasionally flicking the suckers with the other.

“I tried this on myself earlier just to be sure it was working and I found it to be really fun! Dick or Pussy?”

“Dick” Lust responds automatically, not actually understanding what he’s being asked.

“Goodie!”

Holding down the button, Blue brings the tip close to the head of his cock. As it makes contact there’s a loud ‘Crack!’ that makes Lust and Dream jump, Lust more from the sudden jolt of pleasure than the noise. 

“It’s called an electro stim wand! You just hold down the button to charge it and then touch wherever you want to get zapped! What do you think?”

Dick twitching, Lust makes eager grabby hands at the device. Blue obligingly hands it over.

“That was thrilling! Dream, can I try it on your clit? It stings a bit but it feels really good!” 

Nodding, Dream lays back against the headboard and spreads his legs. Holding down the button, Lust gently presses the tip to the other’s gradually swelling clit.

“Oh stars!” Dream yelps, head smacking against the headboard as he jerks. 

“Do that again!”

Pleased with how his friends were enjoying themselves, Blue pulls out the toy he’d been most excited to try. Fifteen and a half inches long with a tapered head and little bumps running down the shaft, the ‘Demon Dick’ certainly struck an imposing form. Blue couldn’t wait to have it inside him.

Grabbing a bottle of silicone based lube, he squirts a large glob out onto his fingers and begins preparing his asshole for the monster in front of him.

It’s going to be a good night.

Chapter Text

Sans couldn’t believe he was actually doing this. Of course Dust had been the one to encourage him to go through with it and to help him pick out his new ah, accessories . He’d also been the one to point out that Killer would be the perfect person to help him satisfy his curiosity.

Knocking on the door to Killer’s treasure room, Sans steps back and waits nervously. Fiddling with his new accessories where they’re safely hidden in pocket of the hoodie he’d borrowed from the very skeleton he’s looking for.

“Come in!”

He jumps at the sudden call, before gulping and twisting the knob to open the door. Peeking in, he looks around for his mate. The Sin in question is sitting on a couch (when did he get that?) in the corner of the room, scowling down at what looks to be a wooden puzzle cube. 

Slipping into the room, Sans quietly closes the door behind him and begins weaving his way through the towering piles of “shinies” that Killer had strewn about the room. Once he finally reaches the couch, he stands silent and fidgeting in front of his mate. 

Confused by the silence, Killer looks up to see who had come in.

“Sansy! Do you need some . . . thing . . . is that my hoodie?”

Sans flushes brightly, resisting the urge to tug down the hem of the hoodie. The black and red pullover ended just below his knees and Sans internally cursed Dust for convincing him to wear nothing beneath it. He nods, face partially hidden by the hood pulled up over his skull. 

There’s a long moment of silence that has Sans squirming in place until finally he can’t bear it anymore and looks up. He shivers as he sees the hungry look on his mate’s face.

“I can see why Criss-Cross and H like seeing you in their clothes so much, you look sexy as fuck Sansy.~”

Sans trembles as his knees threaten to give out beneath him, embarrassment and excitement racing through his body as he steps closer and climbs up to straddle the Sin’s lap. He can see the exact moment that the bigger monster realizes he has his ecto formed beneath the cover of the hoodie. 

“i-i wanted to try something and dusty said i should ask you because you’ve done it before and- mmph!”

Sans moans into Killer’s mouth, immediately submitting to his mate’s will as his mouth is explored and plundered. His tail begins unwinding from its hiding place around his waist and flicks happily in the air behind him.

Finally he has to pull away to gasp for air, face flushed and eyelights hazy as Killer growls at having his treat taken away. Before he can be pulled in for an encore, Sans puts his hands against the other’s chest to stop him.

“w-wait! i want to try something, please?”

A low purr rumbles in Killer’s chest as he runs his hands over Sans’ soft curves.

“Kitten I’ll do whatever you want as long as I get to fuck your pretty pussy by the time we’re done here.~”

Whining in embarrassment, Sans can’t hide how his arousal is beginning to soak into his mate’s shorts as he grows more excited. 

“can, will you, u-um,” giving up on saying it, Sans pulls the black leather collar and matching leash out of his pocket and holds them out.

“willyoupleasecollarme?!”

Sockets squeezed shut, Sans misses how his mate’s soul flickers into a more normal shape. What he doesn’t miss is Killer delicately taking the collar from his hands, a soft jingle coming from the little bell hanging from the D-ring at the front.

“You want me to?” 

His mate’s voice is soft, almost unsure as he asks. Sans opens his eyes to see the bigger Sin staring down at the collar as he runs a finger over the soft, treated leather.

“dust told me that you do petplay with him and crossy sometimes. i, i wanted to try it. dust picked out the bell, he said you’d like it . . . do you?” He asks nervously, fidgeting with the leash still in his hands as he looks up at his mate.

Instead of answering, Killer brings the collar up and begins to gently wrap it around Sans’ neck. Cinching it shut, he wiggles a finger between his bones and the leather and gives it a little tug that has Sans quivering in delight.

“Kitten, Sansy I love it.”

Sans can’t help but whimper at how husky his mate’s voice has become. The little bell ringing softly with every excited breath he takes.

“so you’re ok with this? with me . . . wanting to try being your pet?” 

He’s pretty sure he knows the answer already considering the growing bulge forming beneath him but he wants to hear it. To know that he isn’t the only one wanting this.

Killer tugs him closer using the finger still hooked around the collar and nuzzles him. Pressing gentle kisses to his cheeks and teeth as his low purr fills the air.

“I would be honored, Kitten.~ But first I think we should set some ground rules. Crossy and Dust Bunny have different needs when they’re in the mood to do petplay and I can’t see you being any different. Crossy likes being ordered around and for me to be really rough with him. Bunny likes making me work to tame him before I fuck him unconscious. What do you want, Kitten?”

Sans flushes and squirms a bit, unconsciously grinding down on Killer’s cock as he thinks.

“Do you want to be a good kitty for me? Are you gonna listen and do what I ask like Crossy? Or do you want to be a bad kitty and get punished like Bunny?” He asks lowly, growling as he asks his last question and giving Sans’ ass a teasing smack.

“ah! please! i wanna be a good kitty, b-but that felt good!” Sans whines, unsure of what he wants besides having Killer inside of him, maybe spanking him a little more.

“Shh, it’s ok, Kitten. I think I know what you want, do you remember your safeword?”

Sans cuddles closer, hiding his face in Killer’s chest as he nods and presses back into the hand gently squeezing his bottom. 

“s’ blue. can, can you please spank me more? a-and um” his face blushes brighter as he squirms, “t-tug on the leash?”

Killer’s purr grows louder, one hand rubbing down Sans’ spine soothingly as the other kneads his soft ecto ass.

“Of course Kitten.~ Ok, I have a few rules for my pets so I want you to listen carefully for me.”

Sans nods, pulling back from his hiding place to give Killer his full attention. Tail flicking in the air behind him as his ears cup forward, the perfect image of an obedient pet.

“Stars you’re adorable. Ok, rule 1: pets don’t speak unless spoken to. Meowing and moaning are ok but no words unless it’s your safe word or I ask you a question, got it?”

Sans nods quickly. Seeing Killer’s raised brow, he flushes a bit.

“i got it.”

“Good kitty. Rule 2: when you’re a pet you call me Master or Sir. Can you do that for me, Kitten?”

Sans shivers, eyelights briefly flickering into hearts as he nods.

“yes sir.”

Killer growls as he catches the brief change in eyelights, stars that’s hot.

“Good boy~ Rule 3: if I tell you to do something, you do it. If I ask you to do something you don’t like then I expect you to say your safe word and let me know what you didn’t like. I’m trusting you to be honest with me, Kitten.”

Sans almost agrees out loud but stops himself at the last second. He hadn’t been asked a question and good kitties don’t speak unless spoken to. He nods instead. The look of approval he’s given tells him that he’d made the right choice, tail swishing behind him as he smiles proudly.

“Rule 4: no cumming without permission. If you feel close then I want you to ask nicely to be allowed to cum. You are allowed to speak to ask permission. Those are the basic rules I have. I may make more as I learn what you need as a pet. Can you obey these rules, Kitten?”

Sans nods furiously, squirming eagerly in his mat- his master’s lap.

“yes master!” He chirps, excited to explore this side of himself with his trusted mate/master.

Killer coos, running a hand over Sans’ skull and ears and marveling at how cute his little mate is. He’ll definitely need to thank Dust later.~

“There’s my sweet kitten, I know you’ll be a good boy for me. Ok Pet, give me your leash and stand in front of me.” 

His voice is soft but stern, demanding Sans’ immediate obedience. And Sans is more than eager to obey, holding out the leash he’d been fidgeting with before wiggling his way off his master’s lap to stand before him.

“Good kitty.~ Now strip for me.”

Sans blushes but obeys, grabbing the hem of his borrowed hoodie and pulling it up and over his head to reveal his already dripping pussy. Once naked, he holds the jacket to his chest, unsure of what to do with it.

“Put it on the arm of the couch, Kitten. Then come back and stand with your arms at your sides.”

Rushing to obey, Sans drapes the hoodie over the nearest arm before returning to his place in front of his master, fingers squishing at the plush flesh of his thighs as he fidgets nervously.

“Very good.~” 

Sans doesn’t move as Killer leans forward and clips the leash onto his collar. A gentle, testing tug has him shivering and a bit of slick dripping down one of his thighs.

“Do you like it when I do that, Pet?”

Another tug, another shiver.

“yes master!”

Killer smirks and beckons him closer with a crooked finger.

“Open your mouth.”

Obeying, Sans opens his mouth and hums in confusion as the end of the leash is put between his teeth.

“Hold that for me while I undress.” 

Tentatively biting down, Sans tastes leather on his summoned tongue as he watches Killer pull off his shirt and toss it to the side. Next he tugs down his shorts, revealing his already hard and throbbing crimson length.

Catching Sans’ eyelights flickering to hearts as his cock is revealed, Killer growls.

“See something you like, Kitten?”

Sans nods, a bit of drool beginning to slip past the leash and down his chin.

Kicking his shorts away, Killer holds out a hand for the leash which Sans gingerly drops into it. Wrapping the end of the leash around his hand a few times, Killer pulls hard, bringing the two face to face. 

Licking up the bit of drool, Killer follows the line to the seam of Sans’ teeth where he plunges his tongue inside. Mewling, Sans clings to the other’s ribs in a feeble attempt to steady himself.

Breaking the kiss, Killer licks his teeth with a satisfied rumble. 

“Do you want to suck your master’s cock Pet? Do you want me to fuck your face until I cum down your pretty throat?”

Whining loudly, Sans shudders helplessly as a small peak unexpectedly washes over him, slick splattering to the floor beneath him.

It’s silent for a moment, Sans struggling to think past the post-orgasm haze filling his skull. Looking up, he whimpers as he sees Killer’s hungry, disappointed look. 

“‘m sorry master! i d-didn’t mean to!” He sniffles, tears beginning to bead at the corners of his sockets. Killer’s look softens as he sees the tears threatening to spill down his pet’s flushed cheeks. 

“Shh, I know you didn’t, Kitten. Maybe a change of rules is needed? I forgot how easily my cute little kitten cums.~” Killer purrs reassuringly, gently wiping away his tears before they can fall.

“Ok Kitten, I’m adjusting rule 4. From now on I still want you to try and ask for permission before you cum, but if you can’t then I want you to tell me after you do. Now, did you cum Pet?”

Sniffling, Sans nods purring softly as he nuzzles into Killer’s hand.

“yes master.”

“Yes Master what?”

Flushing, Sans squirms and purrs louder.

“Yes Master, I came!” He mewls.

“Did you cum thinking about having your cute little throat fucked by Master’s cock?”

Shuddering, a new line of drool escapes his teeth and slips down his chin. Skull fuzzy with desire, he turns and kisses the hand stroking his cheek.

“yes sir! may i please suck master’s c-cock?” He begs, looking up at Killer with big hazy hearts in his eyes.

Snarling, Killer stands while pushing Sans down onto his knees.

“Of course Kitten.~ Use your mouth to show Master you’re sorry for cumming without permission.~”

Squeaking in alarm at the sudden change, Sans looks up in confusion but quickly catches on as he bumps into something hot. Leaning forward, he laps up the bead of precum that had begun dripping down the shaft and follows it to the source. Hands braced on his thighs, he leans up and suckles at the tip with a happy hum, the taste of mango and chilies exploding across his tongue. Looking up at his master, he braces himself and begins taking it further into his mouth.

“There’s my good kitty.~” Killer moans, raising one hand to rub over Sans’ ears and hold him in place.

Sans wiggles happily at the praise and pets before continuing his descent. Dust had been helping him practice deep-throating and he really wanted to show his master the fruits of his labor. Pushing deeper, he chokes a bit as the tip finally hits the back of his throat. 

“Remember, once it hits your throat just try and swallow around it. We don’t need to breathe so don’t worry about choking or anything, just take it slow.”

Remembering Dust’s advice, he begins swallowing around the head and ignores the little voice in the back of his head telling him that he needs air. 

“Oh fuck! Ooooohh~”

Encouraged by Killer’s moaning, he keeps swallowing until his nasal ridge bumps against his master’s pelvis. Opening his eyes, unsure of when he closed them, he looks up at Killer with tears streaming from the corners of his sockets and eyelights blown out into big hearts. 

The look is nearly enough to have Killer cumming down his throat.   

“Fuck!~ Look at you, swallowing up your Master’s cock like a good boy!~ Can Master fuck Kitten’s throat? Does Kitten remember his safe gesture?”

Humming around the length filling his throat, Sans taps Killer’s thigh twice and presses forward eagerly.

“That’s right~ Hold onto me Baby, Master is going to give Kitten his special milk now.~”

Obeying, Sans braces himself against Killer’s thighs and moans around him. 

Wrapping his hands around Sans’ skull, Killer begins slowly withdrawing from the tight wet cavern of his pet’s throat. When only the tip remains, he growls in pleasure as Sans swirls his tongue around the head. Hips jerking, he thrusts halfway back in, just barely stopping himself from ramming his cock down the other’s throat. 

Whimpering, Sans tugs on Killer’s hips, urging him to go faster.

“Stars Kitten, you better hold on because I’m not stopping till your belly is full of Master’s milk!~”

Sans trembles as Killer withdraws before thrusting hard back in, filling his skull with the scent and taste of spicy mangos. He loves it.~ He loves having his throat fucked by Master’s cock! With each rough thrust his head grows fuzzier as he loses himself in the moment and takes all that he’s given. Tears, drool, and precum dribble down his face and splash across his thighs, adding to the little puddle growing beneath his leaking slit.

“Fuck! You’re loving this, aren’t you? You love sucking dick~ You’re my good little cum slut!~ Are you going to swallow up all of Master’s cum? Gonna let me fill that cute belly of yours till it’s nice and round?”

Sans whines loudly, eyelights rolling back as he cums again, the puddle beneath him growing bigger as he shakes and shudders apart.

“Fuck! Drink it all, Pet!” Killer snarls, thrusting in one final time before spilling his load. 

Sans gulps frantically, torn between the fear of drowning in cum and the need to not miss a single drop. But there’s just too much for the poor, inexperienced monster to take as he pulls away with a sobbing gasp. He pants heavily as his face is painted with ropes of hot crimson cum, whimpering as one hand drops down to rub at the soft swell of his belly. He feels so full already.~

Killer purrs happily, gently wiping away the bit of cum covering Sans’ sockets with a thumb before sticking it in his mouth. Opening his eyes, Sans mewls around the finger as he licks it clean.

After a moment Killer notices the growing puddle beneath his pet and gives him a raised brow bone.

“Do you need to tell me something, Pet?”

Sans stares up at him with hazy confusion, unable to think of anything he might have missed. He shakes his head.

Killer tsks in disappointment, dragging him up with the leash so he can plunge two fingers into his disobedient pet’s dripping cunt. 

“ah! mmnnn!” Sans squirms as those fingers curl and press against his g-spot, hands clinging to Killer’s arm as he struggles to stay on his feet.

“You didn’t listen to me, Pet. First you failed to drink all of your milk and then you lied to me about cumming again. What do you think I should do? Should I punish my naughty kitten?”

Sans whimpers as he realizes what he did wrong, ears flattening against his skull as his tail curls between his legs.

“‘m sorry!”

Killer hums, taking a seat on the couch once more and pulling Sans down to lay across his lap with his ass in the air.

“I know you’re sorry Pet, but you were still bad and what do bad kitties get?”

Sniffling, Sans wiggles in his master’s lap as he realizes where this is going, excitement beginning to coil in his belly once again.

“b-bad kitties get punished, sir.” He whimpers, tail shifting to drape across his back and out of the way.

“That’s right, how do you think a bad kitty should be punished, Pet?” 

Sans shivers as a hand begins rubbing circles against his right ass cheek. 

“a bad kitty gets spanked, sir?”

Killer purrs, pleased with his pet’s answer.

“That’s right, bad kitties get spanked. Five swats for every rule you break. How many swats do you deserve, Pet?”

“t-ten swats, sir!” Sans whimpers, squirming a bit as the hand on his ass drifts teasingly close to his pussy.

“Very good, I want you to count them for me, Pet. I’ll add another two swats if you miss a number” he warns.

Nodding, Sans braces himself against the cushion in front of him. 

It’s quiet for a moment, Sans slowly relaxing into the gentle pets to his sensitive ecto.

Smack!

Yelping, he shivers as the hand rubs the stinging spot on his left cheek.

“o-one.”

Smack!

“two!” 

Smack! Smack!

“th-three, four.”

Tears soak into the cushion as he hides his face against it. It hurts so good!

Smack!

“hah! f-five.”

Smack!  

“ah! master!” Sans shrieks, the last spank being much harder, skull tilting back as his tongue lolls out.

“Count them Pet or I’ll make you take more.” Killer warns, rubbing gently at the rapidly darkening ecto beneath his hand.

“si-six” he sobs. He still has four more to go and his butt already feels like it’s on fire! Killer really wasn’t holding back but it feels so good! The harsh jolt of pain followed by the heat and sting that leaves his cheeks tingling and his pussy clenching.

Smack! Smack!  

He screams as he’s given two hard spanks. It didn’t feel very good that time!

“w-wait! blue, blue!”

Killer freezes, soul stopping as he realizes the safeword had been called. The high of being dominant over such a sweet, powerful monster fading and being replaced by concern. Careful of his sore bottom, Killer turns the little skeleton over and scoops him up to cradle him to his chest.

“Are you ok Baby? Do you not like spanking after all?” He asks worriedly, looking his mate over for any signs of discomfort.

Hiccupping, Sans takes a few deep breaths to calm himself and allow his brief surge of panic to fade.

“i liked it! j-just not so hard? those last two didn’t feel good at all.” He explains, rubbing his cheek against the warm bones beneath him.

Killer relaxes, relieved to know that Sans was ok. Pressing a kiss to the top of his skull, he gently rubs his mate’s stinging cheeks.

“Ok Sweetness, I can do that. Do you want to keep playing? I can still make you feel good if you don’t want to.”

Sans shakes his head, he wants this. He was having a really good time up until things got a little too rough!

“i-i wanna keep going! please? i wanna be a good kitty for you.” He whines, pressing his sore ass down into Killer’s hand to show he can take more. That he wants to take more.

Killer flushes, his dwindling desire flaring back to life as he’s compelled to give the cheek in his hand a little squeeze, earning him a little squeak followed by a moan.

“Ok Kitten, we can finish your punishment and then I’ll make you feel really good.~”

Mewling in joy, Sans wiggles around so he’s once more laid across Killer’s lap, lightly bruised cheeks raised high in his eagerness.

“u-um could i hold your hand? please sir?”

Cooing at how adorable his pet is, Killer holds out his free hand for Sans to latch onto.

“Of course you can, Baby.~”

Sans squeezes the hand tightly, the comfort of being able to hold onto his mate makes this so much better. Nuzzling into his palm, Sans prepares himself for the rest of his punishment.

“So before we paused you forgot to count two of your swats, do you remember the punishment for forgetting to count Pet?”

Squirming, Sans looks over his shoulder with a clearly faked look of remorse. The little monster unable to hide how excited he is for more ‘punishment’.

“f-for every number i miss i get two more? is that right sir?” 

Happy with his pet’s eagerness and quick answer, Killer gives his ass another little squeeze.

“That’s right Pet, so how many swats do you have left?”

“six!~” Sans moans, tail wrapping around the other’s wrist in search of more pets. 

Smirking, Killer grabs the naughty appendage and gives it a little squeeze.

“mmnya! hmm ah!” Moaning loudly as his tail is played with, Sans unthinkingly bites down on the closest thing he can reach. Which happens to be Killer’s hand.

Jolting at the unexpected pinch, he tugs on the appendage he’s playing with a little harder than he’d intended.

“aahhh!” Squealing around the bones in his mouth, Sans arches his back as he cums hard. Azure slick dripping obscenely down his thighs and onto the couch as he goes limp, little shivers and twitches rattling his frame.

Still up to his ears in bliss, Sans remembers Rule 4.

“i-i c’me m’ster~” he slurs after releasing his makeshift gag, chest vibrating with a loud purr.

Chuckling at his blissed out pet’s attempt to speak, a mischievous look crosses Killer's face as he gets a wicked idea.

Smack!

“nyah!”

Sans jolts in surprise before melting back into his master’s lap. Wait, what number was he on? . . . . Unable to remember, he decides to just start over. His master will correct him if he’s doing it wrong, Master is good like that.

“one,~” the number barely understandable over his purr.

“Heh, forgot what number we were on, huh Kitten?” Killer teases. Oh well, it’s not like Killer could remember either.

Smack! Smack!

Mewling loudly, Sans slips a little deeper into the warm fog clouding his mind.

“t-two, three-ee!” 

Killer chuckles as he gives the tail that had been waving in his face another gentle nip. He loves how sensitive his little kitten is.~

Smack! Smack!

“f’urrr, fi’e.~” Drool drips from his chin, not really sure why he’s counting anymore.

Smack!

With a final hard (but not as hard as before) spank, Killer plunges three fingers into his pet’s hungry slit. 

“aahnnnnya!” Sans squeezes his sockets shut as he’s finger fucked closer and closer to the edge.

“m-master! ple-ah! please! m-may i cum?” 

Clinging to the ledge with every ounce of self-control he has left, Sans waits desperately for permission to let go.

Smirking, Killer moves his thumb to begin rubbing circles around his clit.

“You did so good Kitten!~ You took your punishment so well and I’m so proud of you.~ Go ahead Baby, cum for me.~”

With permission given, Sans locks up with a silent scream. Slick squirting out around the fingers inside him, he soaks the couch beneath him as his vision goes white.

Killer stares down at the little monster in his lap in awe. Carefully withdrawing his fingers, and getting a weak moan of protest in the process, he looks over his slick covered hand. Everything from his fingertips to halfway up his forearm is heavily coated in azure blue magic. 

“mmm.~”

Looking back to his pet, he smiles softly and begins petting down his spine with his clean hand.

“Easy Baby~ You did so good, you’ve been such a good kitty for me.~ Are you done Kitten or do you just want to rest for a bit before we keep going?” He asks gently, beginning the process of licking his hand clean of the sweet evidence of his mate’s pleasure.

Sans groans into the damp couch cushion he has his face pressed into. Every inch of him is trembling as he slowly descends from Cloud-9, his thighs especially are quivering uncontrollably as he rides out the aftershocks of one of the best orgasms he’s ever had.

As much as he wants to keep going (and he really, really does), he’s not sure he has another round left in him. He’s honestly surprised he’s still conscious considering this is normally around the point he blacks out from pleasure overload.

Barking out a startled laugh, Killer does his best to carefully maneuver his limp lover into his arms once more.

“Geez Sansy!~ You still with me, Kitten?” 

He isn’t really expecting an answer, or at least not a coherent one as he takes in the masterpiece of his absolutely wrecked mate. Eyelights fuzzed out to the point the little hearts are nearly unrecognizable, face covered in tears and drool, and a look of pure bliss softening his features. Yeah, his job here is done. 

“C’mon Kitten, you’ve earned yourself a nice hot bath. And don’t worry, next time I’ll be sure to choke you with your leash while I fuck you full of Master’s ‘milk’~” he promises with a low purr. 

Too spent to really appreciate his lover’s words, Sans snuggles into the crook of his neck as he’s carried. Consciousness slipping away as he’s embraced by the warm arms of sleep, Sans has one final thought before drifting into a peaceful slumber.

“Maybe Cross and Dust would be willing to play with us next time?”