You as part of the circle

“Follow me!” She commands, leading you to the back of the shop where you see what must be the summoning circle already made of red paint (you hope) and numerous candles and other macabre items. In the middle of the intricate pattern were what looked like metal restraints attached to the floor.

“See, reading through all the notes, I’m not sure how involved the donor needs to be. But there seems to be a correlation that the more the body is part of the circle, the stronger the demon summoned can be. So this is where I’ll need you, I’m just gonna bind you up and milk you here, do the summoning, and let you out once it’s done.

“Wait…” you get more nervous at this idea, not only because a stranger wants to bind and sexually use you, but you be in the same space as a trapped succubi. “Isn’t this gonna be dangerous for me?”

“Oh no no, they’ll be under my control, I’m pretty sure. Now strip and lay down kitty boy!” The mage commands.