In a vial

“Oh it’s nothing to extravagant, I just need you to cum in this.” She looks around a shelf before pulling out a vial made of a reddish glass, closed with a cork.

“Um… ok sounds easy enough.” You reach out your hand to grab it, but she pauses.

“Um… one more thing though. I found that the purity of the cum will attract different levels of succubi, and in my research the one I need, well, requires cum from an untouched cock.” You look confused, with her clarifying “I need to milk your prostate to get your cum. Don’t worry, I’ve read up on all the techniques so you should enjoy yourself.”

Oh… so it’s not just you jacking off into this vile, but her, to put it frankly, taking your anal virginity somehow. Coin is coin, but will you let her take your ass?