
Look at what i said below to see why. Long story short, the issue here is that you're basing your "it's rape" viewpoint on that it LOOKS like Oono doesn't want it, you're projecting what you think he's feeling onto him, but he actually tells us himself that he'd been in love with Kureshima for a while, but was in denial, that he"d planned on blaming the sex on Kureshima on purpose BECAUSE of said denial, that he'd actually always wanted Kureshima to touch him and that he feels it's unfair that Kureshima is touching someone else after having sex with him and that he feels that he should be the only one Kureshima touches. I've went over literally all of the dialogue below. He isn't upset in ch 4 about the sex, it just makes you think he is for like .2 seconds before making it abundantly clear he's actually just upset that he doesn't know how Kureshima feels about him, he doesn't want to think Kureshima was just playing with him. He gets pissed of and yells "so you were just messing with me!" after Kureshima comes to class and talks to him normally like nothing happened because, to Oono it looks like he was being played with after all. This pisses off Kureshima and he says "you know why (i did it)" and later on Oono admits that he "pretended not to know". Honestly, to say it was rape at this point you literally have to be arguing with Oono himself. It doesn't matter what you think it looked like or how you think he felt, he says that all himself. It's no longer something to speculate about. Read my responses to Melimeio-chan 1 comment down if you'd rather not read my long ass comments.

Just because he has feelings for him doesn’t mean he planned on or wanted. Someone you have feelings for can hurt you and he’s conflicted about the fact that he still likes him despite what he did.
Think to yourself a bit about why you’re writing so much and trying so hard to justify this. Also this is 100% still something to speculate about. Your subjective opinion isn’t right just because you say it is.

The uke said he enjoyed it AND that he wanted it. If you want to say the scene was purposely portrayed as a gray area, fine, but to say it actually WAS rape is factually incorrect as Oono literally says, and i quote, "i yearned for him to touch me again". He says both that it felt good AND that he wanted it.
Why is everyone bending backwards in order to justify what the Seme did? It was rape. There’s nothing wrong with liking this manga but at least accept the fact that it was rape and don’t go posting your several paragraph long essay about how it totally wasn’t rape because they’re “in wuv” and how just because the uke has conflicting emotions about the situation means it was 100% consensual.