So for now only the girlfriend is not human trash

I can understand boobies having feelings for trash-kun, you see it in all love stories and that's fine. They try to win over the other person, hug them, sometimes they also kiss, but it feels fair. Probably because most times the person they love is still single. But this girl grabs someone's boyfriend and starts making out with him 3 meters away from the girlfriend behind a wall... that's fucked up.
Still, I would still put 85% of the fault on trash-kun. Bitch, you can always say no. You can always keep your distance. It's not like someone grabbing your hand, dragging you behind a wall and then making out with you is something you absolutely can't avoid... dude just let it happen. And he is the one who should uphold morality.
It doesn't matter if it's a man or a woman, as long as you are in a monogamous relationship, you should turn down all advances from other people. Not doing that makes you human trash.
Maybe the girlfriend is also trash, but for now we have 2 pieces of trash and a human.
But man, the artwork on the cover... those boobs... author really knows how to bait

85% of the fault lies on the dude, 5% on the transfer student/childhood friend/gravure idol and 10% on her boobs
