After the final exams, I ended up staying at Momo's house. In the middle of the night, I wanted to go to the toilet, so I quietly slipped out of bed so as not to wake Momo, and then I heard the sound of water and an aunt's voice coming from the bathroom... When I peeked secretly, the aunt was... doing it alone. Watching that figure, somehow my crotch started to get hot too... When I was touching my crotch like the aunt, I was noticed by the aunt...