I think Endo might be experiencing internalized homophobia which turned to liking violence and lead to this twisted personality of his/hj
i think you may have confused boredom with internalized homophobia cuz Endo's main issue was that when you act nice or be good, people would respond in a typical manner which he found "very boring & predictable". with all of that boredom, it was a genuine fresh breath of air for Endo when he met Takiishi & became obsessed with his unpredictability. Not to mention, he didn't seem to have any issue with liking guys upon meeting Takiishi.
Robin is such a refreshing mc. He is very much a "goes with the flow" guy but also I love how he is all flustered and pining after his best friend now instead of thinking of things like "Oh no I like a guy kyaa" or whatever. Also they are soo domestic like it feels like they are going on a date after they have been married for years or something. ヾ(❀╹◡╹)ノ~
That's it! Akane x Kana it is.
They have a good dynamic too from whatever little conversation they had. Aqua isn't good enough for any of them and even if he gets together with one of them by the end I doubt he will ever be mentally stable for a good relationship. Even though almost everyone in this manga is twisted in one way or another hopefully Akane and Kana have a good ending.
Yanzi living the dream by getting his face squished to the ML boobs. ε=ε=(ノ≧∇≦)ノ