I personally don’t think the delinquent enjoying the resistance as a sign of her being a rapist. Isn’t this just a very normalish kink, like how a lot of people enjoy being dominated? We even see delinquent girl stop despite getting the resistance reaction she liked. Liking to dominate doesn’t mean she’s going to do it. Morals still rein a person in despite what their kinks are.
I understand that it’s pretty clear she’s been in relationships with other girls before, but I don’t think it there was solid indication that she raped every one of them. Not that there was any solid proof that she didn’t. It seems to me the other girls delinquent dated would have been older and more mature than the middle schooler girl, because delinquent was surprised when middle schooler girl didn’t know what sex was.
In the end it’s a 4-koma comic that doesn’t even make sense and their relationship is wack. orz