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Lily looked up as Severus stepped into her bedroom and shut the door behind him.

"Where's Dad?"

"He's been detained on Auror business." Severus smiled.

Lily shivered.

"You have been a very naughty witch, haven't you, Miss Potter?"

Swallowing hard, Lily lifted her chin defiantly. "I'm sure I have no idea what you mean."

"Does the name Ronald Weasley ring any bells?"

Lily rolled her eyes, trying to play it cool. "My uncle? Of course."

"Ah, so you do recall that he is a blood relation." Severus paused. "Unlike myself."

"You're married to my dad."

"Your uncle is married as well. It seems infidelity isn't something that concerns you." Severus reached into the pocket of his robes and pulled out a phial. "I've brewed something special, just for you."

He held out the phial and Lily watched as the ruby red liquid sparkled in the candlelight. "What does it do?"

"An excellent question." Severus slipped out of his robes and tossed them onto the chair beside Lily's desk. "Once you imbibe this tailor-made potion, only the maker of said potion will be able to bring you to climax—"

"You're joking!" Lily shouted.

"Do not interrupt me again," Severus said softly. "As I was saying, only I will be able to bring you to climax for the next seven days. After the seven days are up, I do hope you'll look for unmarried partners in the future."

"And if I don't?"

"We shall repeat this exercise until I am satisfied you've learned your lesson."

Lily played her final card. "What will Dad say when I tell him what you've done?"

"I'm sure he and your aunt will want to know all the details of how we arrived at this point." The look on Severus's face was terrifying. He handed her the phial. "Do we understand one another?"

Lily nodded and swallowed it down. "Completely."

"Wonderful." Severus reached for the placket of his trousers and pulled down the zip. "Let's see how you look with your lips wrapped around my cock, darling Lily."

Lily dropped to her knees and licked her lips.