FE-215 - 女教師 危険な性白書

The actress who introduces herself as the second Takagi Rikako is quite a beauty, and her naturally sagging breasts are very erotic. She's the one on the cover, but you don't actually see her in that lingerie in the scenes. The premise is that she's a high school teacher, and there's an interesting backstory about her covering for a PE teacher she was involved with when he almost got caught messing with a student. Maybe the cover art is a recreation of that scene with the student.