So... I notice the 'rape play' sequence seems to ignore the fact that role reversal rape already exists. Sure, it's generally considered rare, especially as most of the time the guy probably is appreciative of the attention unless they really don't care for the woman, but the kinds of women I feel most men would be especially repulsed by would probably not have the confidence to pull something like that off for that very reason. Not deemed attractive -> low self esteem -> unlikely to be bold. Kind of holds true with men, to an extent, but enough are pathetically and dangerously desperate.
I will admit, I have a very hard time imagining the reality of a man being raped, outside of grown women taking advantage of little boys that don't know any better... or grown men, for that matter (something about priests or creepy uncles).
That does bring to mind... would this world have rumors about nuns and female priests molesting altar boys or girls or something to that effect? Of course, that's more of a Western thing, I'm pretty sure, as I don't think Japan has nearly the same problem with its native and other popular religions. Far as I'm aware, at least, Shinto doesn't have the same warped chastity rules (to be fair, I'm no expert- I used to date a girl that'd know, though, and she even called herself a miko with her handle... she was also quite experienced, if you know what I mean). Though I will admit that I do expect a miko to be a pure maiden, that doesn't mean it must always hold true (again, like my ex who definitely knew her way around both male and female bodies, even if she wasn't a real miko).
...
Anyway, I really do think these two really are appropriate for each other. I wonder of the more recent, more refined version (classified as erotic instead of porn, so technically a step down on the lewd scale)... if this MC shows up (which the above poster says he does?), will they be more of an exclusive pairing, or will he continue to whore himself out? I get the teacher is sexually frustrated and kinda needs the attention, too, but it's clear Kawashima spends so much more time with him, and they're both at somewhat comparable perversion levels.