Can we see BDSM without it being related to past trauma once??? (╯°Д °)╯╧╧
http://www.mangago.zone/read-manga/yoru_wa_tomodachi/
This one is totally not related to trauma, the uke (sub) even ask is it weird that he has no back story of why he became a masochist, that he just likes it without any reason.
Why are you surprised over this ending? I might not remember correctly, but didn't Azusa trick him into being a pair with him in the first place, and then Kaede stayed out of pity seeing how his mother ended up?
I don't think it's pity though. When he went home, he found the letters/notes that azusa made and gave him when they're kids. It's more like a realization in my take up of things. Though I won't deny that his mother's situation do have a role in the event as well.