Responses

Personally, because he said it at the wrong place and time.
By saying it right after that intercural sex, the most common interpretation will be that he is asking if they could be friends with benefits
(at least in japanese manga context. I have zero knowledge if it's the same thing irl)
That.... kinda makes the seme sorta socially unaware (contrary to what his looks, friend grp imply, & intro in chapter 1 imply) w/c is understandably frustrating to witness
whats with the seme hate? TT everyone saying he wad in the wrong for saying “lets be friends” but i dont think u guys remember theyve barely even spoke LMAO he’s been watching uke from afar its understandable that he asks him to be friends since he doesnt wanna skip straight to anything else… hop off the hate train TT