I was waiting for Eru's silly face when the realization would hit and it did not disappoint.
Love his smile at the end too. It feels like his life is taking a turn for the better and he'll finally work on some of the nastier parts of his personality.
Side note: I think this TL was originally using "femboy" for otokonoko (or some instances of it) and is now using "girly boy". Not strictly a bad thing, word is hard to translate, but just noting it intersects with our main character's nickname in a funny way. We find a boy named Girly in a class of majority girly boys. Which I guess was the joke already, but now it's more in your face