Sweet processing life with big breasts older sister[ADV][Japanese]

Synopsis
If I don't release sperm, I'll have a severe pain.
It was decided that the three older sisters would handle it on a regular basis.

A gentle teacher, Yuri Shichijo, who seems to be serious and mature, and Tsukiyo Kuroiwa, a brown-haired gal.

Let's visit three people after school and ask for sexual treatment ...

fine. I don't feel wicked. I'm just asking for proper treatment ───.

あらすじ