You leave her room

You manage to leave before she comes back. But the thought doesnt leave your head. Does she really want to do this with men? Which guy would willingly let her do this?

You think about how she would do it. How she’d stand in front of the guy, probably dripping wet, finally fulfilling her evil fantasy. While imagining, you unconsciously switch from imagining her doing it to some guy, to being the guy she is doing it to.

You are surprised, almost shocked, noticing that your dick is getting slightly hard. Probably just from imagining your sisters pussy wet.

What in the would she offer that unlucky men for his sacrifice? How far would she go to fulfill her fantasy? Theres no point in thinking about that, you obviously wont engage in something as dangerous as that.

Still, your curiosity is getting the better of you and you go on the internet for some research. You click through terrible images and stories on fetish sites. One type of castration especially catches your attention.