His lover's boyfriend came to the house to visit when he happened to meet his lover's sister in the bathroom, a personality girl named Yua Mikami, who was having sex with her boyfriend in her bedroom, and had a hobby of SM. Then he peeked but he didn't expect that Yua had found out a long time ago but still let him see. After that, he became passionate about this hobby and could no longer resist his lover's sister's lust.
The perverted hobby of Yua Mikami's lover's sister
