My homeroom teacher, Sumire, is everyone's Madonna. She's serious, but always kind, and I've recently noticed that she has a really attractive ass. But feelings towards a teacher and student, and above all, towards a married woman, are just emotions unique to adolescence. But perhaps because of the school trip, Sumire sensei seemed to lose her reason and started seducing me. She slammed her ass into me over and over again, and I ended up cumming inside her many times over the course of three days...