It's not. It's really really not. Like seriously not even a single character or reader saw THAT as the problem, you live in alternate dimension at this point.
So if he saw her as his lover and not his student, he wouldn't have fucked her, given her terrible advices, experiences and expectations of what a relationship is despite clearly seeing nothing wrong with how he handle relationships?
You mean the thing he clearly showed and told you involved sex and just going along with what they said? So I'm right?
Choice she made directly due to sensei as directly told and shown in the manga and by several characters, including Meguro herself.
You clearly don't since you're illiterate. The only thing you seem to know is the weird fanfic in your head that's completely different from what everyone here actually has read.
You say that I'm making points based on a fanfiction but you're ignoring the actual text from the manga, how am I supposed to take you seriously?
It's not everyone though, not everyone shares your exact same opinion about everything, and even if everyone was to share an opinion, that in and of itself, does not mean it's right.
The teacher who he tells about Meguro literally says that he's taking advantage of her, and tells him, it's a problem and it's not okay.
If he saw her as a lover, he would have treated her with respect and not given her the bad advice that you say is so, damaging, so yeah, there was nothing illegal about their relationship, the problem was because he did not treat her respectfully and it was damaging - you've talked about it so much, how can you not understand that simple concept...
You're clearly the one who is illiterate because the more you talk, the more you reveal that you did not read the manga.
Sensei only told Meguro to go out with people, holding him responsible for the choices she made after going out with him, and not acknowledging what she did was her own choice, based on her decisions about how she wants to live her life is beyond stupid.