18+ Shasei Kanri Seido no Nai Ken kara Kita Otoko no Sensei

As the class separates into groups of two, Momonuma is always left on her own. Her rookie teacher offers a hand to be her partner for whatever group project everyone else is doing. But unknown to him, this prefecture has ejaculation control as part of the curriculum and class is in session!

(Source: FAKKU)