Dafuk

Strangulation that doesn't even seem to affect her is very mild compared to the kind of damage that the other two android girls are usually subjected to.

Yeah they're clearly into the masochism side of BDSM. Apparently choking is a lot more common of a kink than people expect.

Kotomi is a masochist, but I don't think Sui is. If you look at the graffiti written on the pavement in post #8093944, it looks like the androids are being bullied. I originally tagged this image with "1boy", but I changed it to "1other ambiguous_gender" because I'm seriously starting to suspect that the POV character in this image is a girl. The wet spots on Sui's hoodie look like the POV character is crying, and I speculate that she's strangling Sui because she's jealous of Sui's singing ability.