I actually agree with you!
Good observation! Just glad that Atsuto stopped in time before he fully penetrated Ohdai. I think he walked away since he came to his senses and felt very ashamed that he was forcing Ohdai.
I agree. It also looks like Atsuto's going to start avoiding him from now on. It kinda sucks that he's very weak when it comes to communicating or being straightforward. If he was, they could have cleared the misunderstanding and would have been on the "same page" earlier on and have avoided hurting each other.
MC was right about broken gauge = broken rationality = molester but the meter isn't really literally a "horny" meter or "just" an indicator of level of arousal. It's an indicator of someone's frustration, probably both of the sexual and romantic sense, that's why blackhaired dude's gauge was always full and cracked and broke when they were fighting. He wasn't aroused from the fight, he was very frustrated about the whole ordeal - the massive disappointment he felt. I'm not justifying his actions but I just want to suggest that instead of completely snapping due to arousal from fighting, maybe he lost his temper and therefore his control.
If I'm saying something obvious/ something that should have been left unsaid, then... Oh well. ¯_(ツ)_/¯ sorry