Hitotsu Futatsu Himitsuひとつふたつひみつ ; 一两个小秘密 ; One or Two Secrets

From Yaoi Is Life: Ishigami-sensei has a secret. He's lived for twenty-eight years desesperately hiding this complex, but after an unexpected turn of events, student Hanai found out! Ishigami asked him to not tell anyone, but for Hanai who's bearing sentiments for sensei, is this a chance to get very intimate...?!