This is bad, however to liken it to the same situation if the sexes were reversed does help further the retarded idea that gender is a social construct.
I also have to consider what I wanted when I was 13/14/15, and it was pretty much just me imagining and fantasizing about something roughly along these lines until I was borderline insane. I seriously doubt, if he is anything like I was, that he would suffer anything like the same psychological trauma as, say, a boy molested by a homosexual man, or a girl molested by a man, and that's assuming that you're using the word "rape" to refer to sexual acts performed against the will of the victim, rather than using it to refer to sexual acts which may have even been initiated or instigated by the victim, but the victim was not legally able to consent.
Because if it is the latter, I have to imagine that if I were, say, 14 or 15 as a high school freshman, and managed to get into the pants of an attractive female teacher in her, say, late 20s, as opposed to a female student of the same age (as was not uncommon), and then this was revealed, I would have assumed I would be in huge trouble for doing this, and would likely find it hilarious to this day that I was somehow the victim in this situation, and furthermore that people use the word "rape" to refer to what happened.
Of course people will read this and shove words into my mouth, no this is not "good", and obviously there are a range of different possible situations, most of which absolutely qualify as "horrendous". I'm merely making a point that people see this issue as being black and white, and try to shuffle "male students who intentionally got with female teachers" (and are usually expressively proud of it) into the same category as creepy male teachers who molested female students. The two are not the same thing, because gender is more than a social construct. Apples and oranges.
