Sexy, the quiet and understated sister-in-law. When she was at home, she wore glasses and had a plain face, but one morning she came to her with light makeup. Her brother cares about her a lot, so she starts to change a little bit too. Brother can't help but confess that he has always been in love with her. Sister refuses, saying they are brother and sister. But the two end up rubbing each other's crotches and promise to end the relationship with just one thigh. Although it ended, the passion of those times still burns between them ......