Because Meiko's dad is too strict, she has never been allowed to spend the night with her boyfriend. Therefore, after discussing it with Rin, both decided to travel together with their boyfriends. On that day, however, Rin's boyfriend was called back home by his wife, so Rin had to go alone. Disappointed, she did not book another room and stayed in the same room with Meiko instead. While taking a shower, Rin accidentally caught Meiko and Kashigawa having sex with each other. Feeling extremely lonely and seeing Kashigawa's enormous member heightened Rin's thirst for love. Waiting for Meiko to fall asleep, she took the opportunity to wake her up and used her body to seduce her best friend's boyfriend...