Responses
That would be a sudden twist of the plot and is actually quite interesting.
This could explain why he just drop that other bottom he was having sex with (chap1) and rushed to help the MC from falling, or explain also why he's behaving like he knew the guy since a long time and actually loves him already.
My theory is that one reason why might the seme be tired of the uke "acting innocent" is because they've done this before, i.e. they were in a relationship that Mieum may have forgotten about for some reason. So the seme knows that uke is not a virgin. But it could also just be me trying to rationalize a BL author's kink. Anyway.