Perfectly willing to be tortured, but i have been bad about following the game, though I did initially read it to what had been posts (last post was first victim screaming 'this is not concentual!'). heh. harder to follow when I don't have a role in mind yet.
My only hard limit really is no bathroom stuff.
Amputation is neutral, but part of the role if that's what you want. I prefer more inventive pain than mere dismemberment, though obviously it's quite traumatic for the victim. on those lines though, castration should only be as part of the final scene.
My preference is for a heavily sexualized experience, which could vary from being in a position where at the end of each night he's being ridden and knows if he climaxes before they are done enjoying themselves, they'll kill him (and obviously, eventually he does, whether form broken spirit or their sexual skill.) to each night being ringed then aroused, which will keep him hard until released, before they begin their games, again preferably with actually sex being involved.
And I paused long enough to fully catch up with the story, going very well so far. :)