Offer yourself

Either out of lust or out of fear, you stay put, looking at the demon nervously.

"Are you ready to become one of us, slut?" the demon says, pressing his huge cock against your pussy.

"Yes," you murmer, your pussy aching to feel his cock inside.

"Then say you want it!" He tells you.

"I want you to fuck me! I want to become a demon slut!" you scream, and he grins, and plunges his huge dick into your tight pussy. It hurts a little bit at first, but you get used to it.

"This is your future then!" The incubus says, thrusting deeper into your pussy. "You will serve Mistress Lilith well!"

You scream as he cums deep inside you, and you black out.