Read manga: Otona-Chan.

manga
Genres: Romance ; Yaoi
Artists: UMIYUKI Lily
Status: ongoing
Latest chapter: Chapter 6
Updated at: Aug 25, 2019
Summary:

High school student, "Otona-chan" is popular among both guys and girls with his cute looks. But instead of being treated like a child, he wants to be treated like an adult and really admires cool adults. And then comes a student teacher to his class, who is very much adult-like and he falls hard...[By Yaoi Desire Revolution]