Traveling together, seducing your best friend's girlfriend

Because Meiko's father is too strict, she has never been allowed to spend the night with her boyfriend. So after discussing with Rin, they both decided to take their boyfriends on a trip together. On the day of the trip, Rin's boyfriend was called home by his wife, so Rin had to go alone. Disappointed, she didn't book another room and ended up sharing a room with Meiko.

While taking a bath, Rin accidentally saw Meiko and Kashigawa having sex. Feeling lonely and seeing Kashigawa's huge penis, Rin's sexual desire increased. After Meiko fell asleep, she seduced her best friend's boyfriend with her body...