This is one of those rare BL's where u see the couple spending time with each other and playing and having fun together. Like a real couple. Also they're a hot pair.
I'm glad Masaki found someone better for him, and got over his toxic feelings for Chiaki. Neither of them were in a good head space then, but I don't begrudge Masaki anything, cause Chiaki doesn't either.
So at least this shows that the brother being an evil (and useless) ass is caused by both nurturing and nature.