When I was in high school (admittedly, decades ago), there were some hottie student teachers brought into teach English. I was 18, they were 21, so not much of a difference in age, and I went out with one of them. It didn't go too far, but it could've, but we were both kind of worried about the ethics of it even at that time. She was a student teacher, getting work experience for teacher's college, and not a real teacher, but it still somewhat worried us. So we both decided to not pursue it, and meet up again maybe after I'd left high school and gone into university. Of course, by that time arrived, we never bothered getting in contact with each other, it just sort of fizzled away, but if we had pursued it further while she was still acting as my teacher, I think it would've gone somewhere. It was a bit of a bummer, that we couldn't pursue it at the moment we were in contact with each other.
Anyways, this girl being a math teacher, would make this even hotter. Math teachers are a much nerdier lot than English teachers, and to have a hottie teaching math is quite rare. Algebra and calculus would've been a lot more interesting if I had a hottie teaching it. Though she was flirtatious with the students, I don't think it ever went much further than that with her. But she does need to suffer a bit of a penalty for walking the edge like this.