
The little brother is jealous of his father for taking the role as "Cherry-sensei" to his bro and the older brother is just sitting in the corner being a pure (or at least as pure as any BL lover can get) cinnamon roll and just wants to enjoy his yaoi.
Also, even their mom is a fujoshi. The whole family can enjoy their yaoi together.

“It doesn’t matter where I am.
Even if I act, talk, and laugh the same... After all, it’s all foreign to me.
I am gay.”
Lol
...
What?

Probably something lost in translation.
Or it could just mean that he doesn't talk on the same wavelength. That would make sense because while all the other boys would be talking about girls and a future that would involve growing up, getting married and having kids - that wouldn't be in store for him. Talking about his own future would make other people uncomfortable or exclude him.
If you think about conversations you have with your friends and imagine how your responses would change if you were gay you'd get it. Even something as simple as talking about a movie you saw can change.
The girl and her friend talking about whether or not the elf was an uke or seme was relatable on so many levels.
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its sooo effing relatable