Vivarium
Okay so, something about this worked for me earlier since the plot seemed like a more realistic and less extreme take on the whole being locked up thing, and I didn't dislike it early because the MC was cunning and straight up a crap human. It becomes evident things are pretty weird pretty early on but damn the twists that this one takes means that we get an actual goddamn plot petty good at nailing the psychological aspects while the characters make it hard to take the stakes seriously, which keeps it weirdly light. It's good but in a way that I have very mixed feelings about it.
Profundis
Dark, but interesting. I kind of like the fact that the sex scenes are more psychological than actually all that hot.
A Tree Without Roots