Seiso na Doukyuusei Hitozuma wa Ore no xx de Aiyoku ni Mezameru.

Freelance writer Kazuma meets Misaki for the first time in ten years at a high school reunion. After hearing about her dead bedroom situation, he jumps on the chance to bed her under the guise of a "concerned friend." They start out at a love hotel but things quickly progress to secret dates and rendezvous, even creeping into Misaki's own home. What's more, the longer their passion continues, the more Misaki remembers the pleasures of being a woman, until...