Hex Maniac - World-Changing Waifu

Read a weird doujin about this particular Hex Maniac, that she seduced male trainers, killed them and dumped them into that river, then poured the semen of the trainer into a bottle, then started doing it again.

If that's not a viscous cycle, I don't know what is.

Wait i thought the Hex maniac doujins were vanilla with handholding and other stuff