Here, a pretty wicked (female) student rapes her (male) teacher, whom she adores to the point of obsession. He tries to stay faithful to his fiancee... slowly but surely, she breaks that bond, and slowly but surely, he willingly does more and more with her.
This was supposedly Volume #1 of a series, but sadly, no further volumes seem to exist, at least on DLSite... indeed, it's the only work from this circle.
Bit of a shame, really - the art is pretty darn good.
I'd like to give this a translation sometime.
001: Title Slide 002-104: Story 105-207: SFX Only 208-310: Textless