Recently I found out that reading doujins or watching hentais where the girl is isolated from the rest of the world and fucked senseless turns me on really much. So I'm looking for stuff like that, where the girl is mind-broken in some other realm or in another dimention or inside some monster or in some dungeon or cave or some abandoned factory or sth like that. I mean, not like she is raped by some guys on the train. Basically, stuff where the girl is mind broken endlessly till the ends of time and cannot physically escape. Or something more or less between those lines.
Good examples are:
[1]Solo hunter no seitai
[2]The Swallowing of Natsume
[3]Inyouchuu
[4]Predation
[2]
[3]
[4]
you might wanna post this in /d/