Makoto from S and Riko from M also matched each other's sexual preferences, and they were a close couple. One day, in order to introduce the man to Rico's best friend Sora, they invite Makoto's friend to a hot pot party, but just before the event, Makoto's friend can no longer participate, so they have no choice but to join. To surround the pot. Sora is asked to go out to buy some alcohol, and by chance she witnesses Makoto and Rico having sex. Makoto is awkward when he is peered at the sight of him ejaculating, and Riko knows nothing. At the hot pot party held, Rico has already gotten drunk and falls asleep, and the little devilish Sora begins to tease Makoto's nipples...
