Semerarete ~Onna Kyoushi~

A female teacher next door who brings in a man or masturbates every night, has her moans leaking out. The protagonist feels lucky about that, and is always peeking at her through a hole in his room while masturbating satisfactorily. But one day, Eri stormed furiously into his room. Could it be that she discovered the hole? [Translated from Getchu]