"Alright it was fun toying with you but I really should get going and seal the deal. Been nice knowing you."
"Wait what do you mean been nice knowing you? What are you planning to do to me?"
"You my dear are the payment I'm due for my servitude. I've already claimed your body as mine, now all that's left is your humanity."
With a snap of her fingers Vex teleported in a cloud of sulfer and brimstone into Jon's room.
"Wait I know this place, it's Jon's room what are we doing here? Wait don't tell me!"
"Correct, I'm here because of him. But judging by his current state I don't think he even consiously did it."
Sprawled out on his back laid Jon passed out, one hand grasping the stone. His shaft fully erect, exposed and poking upwards for all the world to see having escaped the confines of his pijamas.
"Well, well, well looks like little Jon is ready and eager to complete the ritual. Makes things so much easier."
"Don't tell me you intend to force me to have sex with Jon?"
"Oh no, I'll be the one doing the fucking. You're just along for your final ride."
Vex approaches Jon's bed, her clothes vanishing.
"One unfortunate wish and I'm done for I got to be careful and get this done quick."
Vex brushes her hand over her pussy imparting a suddle glow to it. Karyn immediately knows from the sudden influx of stimuli what Vex did, she made their pussy many, many times more sensitive. Karyn could feel herself almost orgasming when Vex crawled onto Jon's bed with the grace of a cat, straddling Jon.
She delicately pries the stone from his hands before throwing it off to the side well out of reach. With a smile, she reaches down once more for her vagina now very wet. With her fingers she pushes the lips apart before gentily decending on Jon's member.
A muffled moan escapes Jon's sleeping lips. Meanwhile Karyn trapped inside her own body is literally loosing her mind from the pleasure but still Vex's magic prevents her from actually reaching climax.
Vex starts to slide herself up and down Jon's shaft with increasing speed as Jon starts to wake up. Just as he finally opens his eyes Vex finally releases Karyn allowing her to orgasm. For a brief second a chain appears binding Vex to Jon.
"Good evening, my master."