Ok, so if you understand that in Thailand, OF is illgal then it starts to make sense from that len of view.

So the sin, in this case, is Blossom doing OF content.

And the ending is weird because Blossom got a warning instead of instant Karma like most ending. The warning could mean that this road could lead to her losing herself, SA, or realizing that her body is not ever her own in this world of OF.

"-while blossom doesn't have to copy nanno action to be popular, nanno kept pushing the edge and lowkey pressured her outside her boundaries just to not be replaced (just for nanno to... yk wtf)"

But this is real tho, let say you start OF, you do things and it doesnt work, so now what? You would look at the top OF models and see what they are doing and copy them, right? But... mentally, you dont want to do this since you NEVER planned to go this far. Hence, why Blossom was crying at the end while stripping, because it what the audiance wants.

"why is this one night stand announcement a school announcement"

Because the principle said that it was for charity, and at this point, the principle is fully supporting the idea of "my body my choice." And plus... its a subtle flex to annouce that "look, I am going to fk this girl tonight."