so uhm can someone explain to me how this is a BL?

Want a spoiler?

when mc grows up, he gets together with his commoner friend, the black haired boy

yes please!!

thank you for explaining!! :) imma give it a read.

As stated above, Fran and Treize will get together.
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Then they'll do the deed. Ngl~~ it made me feel weird coz in the novel/manga, the story started when they were kids. It feels like I watched them grow that's why I've grown attached to them xD so them doing the deed (when they're not even 18 btw)gave me a whiplash. Lol