Natsu ga Owaru made The Animation / 夏が終わるまで The Animation

One day, Yui and Ko, who are childhood friends and lovers, have sex in the club room.
However, it is threatened by the pervert teacher who was watching it for that reason, and Yui who allows the body on the condition of stopping.
At first it was Yui who felt aversion to being fucked other than Kou, but gradually his body began to feel pleasant.
Eventually, the secret hole in the back that has never been touched by her boyfriend will also be trained by a pervert teacher.