
Hmm... This is interesting so far. To me, it seems as though the story line is going to have a lot more depth in the way that it approaches sadism.
So far, when I have read s/m yaoi, the sadism is usually limited to sexual encounters. At the moment, it is a bit hard to tell, but it seems like that will not be the case for this manga.
It appears as though the main character very consciously doesn't want to hurt his friend and feels bad when it happens. However, at the same time, he impulsively does sadistic things to him and gets satisfaction from it despite himself.

Lmao, I was gonna comment like "Slouching, more like hiding his boner," but my fellow fujoshi/fudanshi are just as keen and mentioned it already hahaha. It's like we're all trained in the art of..... erection detection?
I wasn't intending to say that but it just came to mind and I couldn't stop myself... (≧∀≦)
Ugh stop quibbling and go get your tsundere man-baby. He obviously wants you, dumbass (● ̄(エ) ̄●)