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This is actually connected to 2 other chapters Hamao did years ago: #1 is from COMIC Kairakuten XTC Vol. 6; #2 is from COMIC X-Eros #43. Both are compiled in the tankoubon titled "Candy Drop". They aren't yuri though.
Statutory rape, check. Seriously, that teacher/nurse disgusts me, preying on a young and insecure girl like that, one that's already in love with someone else to boot. To think that such things actually happen... a good story, though I'd have preferred a happy ending.