And also, most people don't even know what she did to the mc, so it's impossible to say whether what she's going through now is karma or not. To me, she must have done something really messed up shit for the guy to have held onto so much hatred.
The Related tab, specifically the Chapter 14 flashback, gives us insight into how bad it was.
It wasn't just a bit of teasing, slap, or punch. It was outright sexual assault.
You're overrating the relevance of that chapter, at this point.
That was one of the many acts of bullying he suffered at her hands, and it wasn't even alluded to in the flashbacking he did in chapter 26. At best, that's the back-breaking straw. We can safely assume that the bullying he endured was pretty awful, even without the R18 version, because Japanese bullying is already pretty awful.
He's not bent on revenge because she made him jack off on camera. He's bent on revenge because she led a Japanese-style bullying campaign against him at all, and furthermore can't accept that she actually changed
and is making amends
that he allows her to make, and that he reaps the benefits of.
But, sure, let's talk about the R18 version that showed us how she made him jerk off in front of her. If we're going to talk about that chapter 14 like it bears weight in the main narrative (that doesn't allude to anything that happens there), we have to take all of that version as canonical.
So, let's talk about how the R18 version is replete with him going HAM in those cheeks. Hitting it like he wants to make her a mother. Got the hams oscillating like a Slinky in a physics class.
Without already selling me into slavery, you couldn't pay me to have sex with people I hate, but this guy does it for free-- in fact, he wants to do it at the potential cost of
fatherhood. "Revenge", my ass-- hell, "revenge",
her ass.
The MC's just a snake and hypocrite whose commitment is to satisfying the maelstrom of his emotions. It's why his 32 IQ-revenge plan involved him ingratiating himself with his former bully instead of just participating in the bullying already happening against her
like he now just did. It's why he constantly has sex with her (again, assuming the R18 version is fully canon). It's why he lets her repeatedly sacrifice herself for him-- only to disregard all of the aforementioned when he feels himself relenting from his original goal. He doesn't even think it's a farce on her part-- he just still wants to hurt her even though the person he wants to hurt is
no longer there.
Can this dude even get a satisfying revenge from someone who's fully willing to be his Aunt Sally?