Dude definitely wanted a threesome
We're dude. All of us want the threesome.
Hmm. I don't like this. While I think the sister would be a good subject, she's naive and easily influenced. She's going along because she thinks he likes her. This really feels like she's being taken advantage of here.
It's on brand, I think. He already filmed his teacher getting baited into peeing like a dog, and vibrator tortured Honjou, etc etc. The BDSM is like the wallpaper in the room. There was already an actual rape, what's a little pseudo-consensual rape play?
The story wavers between being full-on fetish hentai, being an actual drama, and being an ecchi absurdist comedy. Just when I think the drama matters they do something like shoot a vibrator out through two layers of clothing. Just when I think the comedy is foremost, some college creeps cum on Touka's legs while she's asleep. It's a whirlwind of genre indecisiveness.
I'm with you though, the fetish stuff is a little hard to take in. I like the goofiness and the excellent drawings of tits and the flirting, but I'm not into BDSM let alone rape play. I'll just skim over it when it happens.