She submits

It was clear that Gabriela was having trouble thinking about your question. It was hard for her to focus on anything other than the massive demonic cock that was stretching her cunt. "FFffuuuck!" She arched her back and tried to get your cock even deeper inside her, it was clear that her choice had been made but you wanted to hear it from her own lips. "Mmm... It's so bad, but if being a demon is anything like getting fucked by one... Make me into a succubus, I can be the nastiest -Ah!- whhh... Whore of hell as long this doesn't stop..." Well, that was easy. You grin and move your tail, penetrating Gabriela's ass. She lets out a brief whimper but the smile she gets on her face makes it clear that this whore is enjoying it completely.

Soon the whore is screaming out her pleasure as she is being ravaged by the sincubus cock and tail. Getting bored of the missionary position you turn her over, face down on the bed, making her whimper as your wet cock and tail come out only for a moment. "Please don't stop! Take me, I want to cum on your cocks!" You waste no time in penetrating her well used holes again. You lean in and pull her hair to bring her face to your, this is no lovers kiss just two sluts in heat sucking at each other's tongues. Soon the mortal, despite her nymphomania and eagerness is left a drooling wreck, letting out a moan each time your cock and tail penetrates her. "Are you ready for the grande finale whore? Will you give up your soul and damn yourself for all eternity? Will you become a disciple of Lilith?" you whisper in her ear. You aren't certain if Gabriela's whimper is a reply or if she can even hear you at this point.