I really don't think Kirino will ever end up like their teacher. He's got a much more stable head on his shoulders and has a lot of compassion for the people around him. But, completely agree that it just plain sucks. I'm sure he has his happy moments and loves his kid, but it really hurts thinking that a kid who threw up after having sex with a girl has to suppress his feelings the rest of his life as a married man. I really wish his mom had been as accepting of him as Mishima and Yumeno's moms were, but I have to say that the author did such a good job of portraying his mom. She's not some one-dimensional villain, but a concerned, confused parent who wants the best for her kid but has no clue what that is.
I don't think that Kirino and his mom made the right choice, but they made the choice themselves and it's such a common one for people in the real world, so it was interesting to see it go down that path rather than a fluffy but unrealistic one.
of course i know that kirino won't end up like the teacher, but i was comparing him to the teacher because his situation is quite similar. given the fact that they both grew up repressing their sexualities, and also got married to fit societal standards.
my heart truly hurts for kirino. he ended up becoming the one thing he truly hated. he knew his fate when he saw that disgusting, but pitiful teacher. how long will he keep living unhappily just to uphold society's expectations? how long until society will finally stop being so unaccepting towards gay men? how many others share the same experience as kirino? something like this is completely unavoidable if society would stop caring so much about who other people love/how others live their lives.
this manga was so beautiful, it'd been a while since i'd actually cried over one. i'm happy things worked out for yumeno and mishima though