Her girlfriend's sister is a lingerie model.

Especially when Ashida and Miwa are having sex, while Hiyori is still standing on the doorstep watching, doing all kinds of erotic movements that make her unbearable, and ejaculating immediately. After making love to his girlfriend, Ashida goes to the bathroom and finds Hiyori waiting there. The rubbing against Hiyori's soft beautiful body made him heat up and quickly stood up. Hiyori helps Ashida express milk to calm the heat, but he can't take it anymore and quickly ejaculates. And from there they began this clandestine relationship with each other. They especially liked each other's clumsiness right next to Meeva. When your girlfriend is sleeping in her room, bathroom, living room, or right next to her.