Hokenshitsu de Suki ni Shite

Hokenshitsu de Suki ni Shite summary:

The partner of a one-night stand makes a surprise appearance at school! Tsuroga Kyotsugu, a confident and handsome celebrity senior high student, makes straight-forward love moves on the boys' school infirmary doctor, Tokuyoshiu Manaya, turning Manaya's world upside down. Manaya has never had a thing for younger partners, but Kyotsugs's relentless pursuit and sexual prowess drives him wild with ecstasy. When his ideal partner turns out to be a younger man and a student, what's Manaya to do?