Behind the scenes, this is an effect of the rewrite, he was willing in the original and it could have ended up happening even sooner than it actually did without the other two girls checking on Ayane interrupting the fan favorite bathroom scene that now has her faint instead of what happened in the original.Actually this talk about Sensei reminded me that one thing that seems to be in pre resets Sensei's favor when it comes to shittiness, is that he didn't seem to want to fuck Ayane pre resets:So, I think it's fair to consider current Sensei more of a slut and a cheater, than Pre Resets Sensei.You don't have permission to view the spoiler content. Log in or register now.
He didn't seem to be someone who'd cheat on Maya, albeit the Yumi detention stuff could imply otherwise, and he likely was cheating on Niki with Sekai, but that's a little hard to judge fairly considering his relationship with Sekai, was, well.. a special case.
In universe, as in if you were to look at it as a resident of Kumon-mi, that seems more likely because she doesn't seem as willing as she once was, pre-rewrite Ayane was more forward. He could be seeing her as a risky target, one that could ruin his chances with the rest. Ayane isn't exactly the quiet type when she's not okay with something nor is she the type to let things happen unless she wants them to happen, she could be seen as a threat in being one of the girls who would blab if he tried any funny business, which means goodbye teaching job AND any trust he had with the girls. That said, she might be a uniquely hesitant case because of her admitted feelings.