Sapphire's manga / #Tutor(2)

Trying to find his little sister a tutor for her college exams, Arimura, who has a giant sister complex, enlists the help of a younger classmate whom he use to play baseball with in high school.

After he discovers he is gay, university student Oda wants to have sex with someone, so he meets up with someone he finds on a dating website. That man is a gentleman, so Oda calls him "Casanova." They were supposed to have a one-night stand and not know each other's identities, but whatever he does, Oda cannot forget him...-