Exactly!
Just because someone went through a lot doesn’t mean they get a justification to betray others.
In this story, morals and dignity went right out the window, all in the name of excuses. And the fact that he said he doesn’t want to do it in the same bed is proof that he knows it’s wrong. If you’re aware enough to set boundaries like that, you’re aware enough to know you’re doing something shitty—no excuses
no exactly, like from my pov i feel like he thinks its needed to repay his sister for all the shit that shes fone so hes just letting her do whatever she wants w him, like hes probably been in sex work for years and this is genuinely the first time he felt something that makes him want to stop doing it or he thinks its morally wrong, im not trying to justify sleeping with others while in a relationship or talking stage but its so obvious that hes being exploited, idk how people come up to conclusions that hes cheating by the way the panels are drawn, the backstory behind it, and the descriptions with it.

Even if partner knows, it's still cheating; the partner just knows about the cheating.
Seme is fully aware of what he is doing, so he is a bad human being.
''He went through a lot'' oh GOD i love this kind of justification. Yeah, people love to use that excuse to brush off bad behavior. Going through a lot doesn’t give someone a free pass to hurt others. Accountability still matters.