H01310 Shishunki no Obenkyou Ep 3 - Kobayashi and Kasuga Trapped in Gym

Kobayashi and Kasuga used to visit each other's homes but lost touch over time; one morning, Kobayashi runs into Kasuga at school and is embarrassed, so he escapes. Later, Kobayashi is punished for being late and must clean the gym, with Kasuga forced to join him. They talk about old times, but Kobayashi remembers having sex with Kasuga and feels uneasy, tries to leave, but the door is locked. It is hot, they take off their jackets, Kobayashi notices Kasuga's chest is bigger now, and Kasuga admits he is holding back from peeing, so Kobayashi considers using a plastic bottle.