Manyuu Mesugaki wo Wakaraseru!

Sho Aiba, the homeroom teacher of Class C, was having a hard time getting his students to listen to him. He especially had it especially difficult with Riko Kishihana, a big-breasted girl, who would provoke him wherever he went, even in the middle of class. Riko's provocations escalated day by day... Eventually, Sho ranned out of patience and crossed a line to make the cocky brat understand...

(Source: DLsite)