Rin and her boyfriend plan a sleepover camping trip with her best friend's couple. Recently, Rin has been sexless and frustrated, so she drinks nonstop from the morning. In the heat of the moment, she tries to seduce her boyfriend in the middle of the day, but he skillfully evades her. Exploding with frustration, Rin approaches her best friend's boyfriend, whom she has had a crush on for some time. She sneaks into the shower room, where she takes his naked, surprised cock between her F-cup breasts and fucks him doggystyle. The next day, she continues to enjoy cowgirl sex in the tent and the car, hiding... Unable to contain the pleasure of cuckolding a man, Rin begins intimate sex with her best friend's boyfriend right in front of her best friend, but...