That makes me think of hilarious ball stepping and candlewax so that's much better.
Or the actual cock and ball torture which involves high heel stomping, steel toecap kicking, sandpaper masturbation and cheese grating the balls.
It's part of the extreme side to BDSM and involves men that love intense pain and/or don't mind their genitals mutilating.
BDSM is a very dark rabbit hole that ranges from the light and awesome that i'm into all the way to body modifications up to and including having body parts like fingers and toes cut off during sex.
Those really into pain sometimes have implants, usually coral, under the skin that cause constant pain. There are even metal eye implants.
Simply put, unless you're prepared to see some weird and often quite disturbing shit, don't follow the thread being laid down with C&B torture. Stay in your happy place.
Or that's a massive red herring.
I like to think it is because i'm on her romance route and hope we can redeem her at the end but something tells me it's too obvious so will likely be a twist.