When he mentioned his twin brother i was like,"did they talk about it offscreen or something?" I felt like I missed a part where Haruhi must have explained everything and told about his twin brother. But it wasn't shown. The manga could have used some more chapters showing a proper conversation about Haruhi's self acceptance and also Masahiro's feelings for him.
Reminds me of this manga sm
https://www.mangago.me/read-manga/shijima_no_tsuki/
Because that was exactly the case here
I think he saw his I'd when he brought uke to his house that's why he thought he got twin bro or something
I have some deep trust issues, but I wasn't getting ulterior motive vibes from Masahiro. It was more like stalkerish with how he knew about Haruhi's twin brother when Haruhi never told him about his twin, and in multiple other instances, it just kind of felt like he was pretending to be nice, and when we got to see his real personality in the last chapter, Masahiro felt like a completely different person. Again, don't take this seriously. I've probably read too many bl webtoons where the male lead is really possessive or toxic. Like I said, my trust issues are deep, so of course I'm going to be suspicious of a male lead who is such a green flag. But nonetheless, this was a cute read. :)