Did you also skip the part where shin found out the first time he did that after jake stalked him in that motel and shin didn’t do shit about it? No wait. He did. He did jake. They fucked. And that was about it.
Or back around chapter 20 when he got more turned on, saying “I didn’t expect myself to enjoy it”, when they fucked in the garage infront of Jake’s car which had a camera installed.
Shin knew and was fully aware of all this behaviour and accepted it without any protests. Since day 1. And if one day he decides no and draws boundaries, like they talked about in one of the recent chapters, jake will undeniably and immediately stop.
Media literacy crisis man.

I did not like the part where he was jerking off on his face ...this is not okay don't do this to your partner honestly disgusting.