Does it contents rape?
Spoiler maybe idk.
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Ig you can call how they started rapey. No wait! It was rapey actually. Misaki was being homophobic so usagi san gave him a handjob.
It doesn't really help that Misaki is super shy even after they get together. He enjoys the sex most of the time but never expresses it to usagi san. He just keeps saying that he feels good in his head.
It was only in the recent chapter that he finally said it out loud that it felt good lol.
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Anyway, you should definitely give it a read. Its packed with emotions and one of my absolute favorites. The start maybe a bit yuck but it gets a lot better.
I think Taichi is really confuse here. The reason he behave like this is bcz of his parents relation. He thinks his mother cheated bcz of sexual frustration. So he thinks if he doesn't 'love' Naoto enough he will leave him too. That's why every time he see him with any girl he gets self conscious and the only salutation he can think of is sex, his language of love. And in frustration he behave the way he shouldn't.