Boys' Love Novels Three person play Futami Charade Library

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In the summer of the second year of high school, Teppei had a physical relationship with two childhood friends - Kyosuke, who was an honor student at the same age, and Shigeru, an English teacher at Teppei's high school.
There is only one rule of play. Three people play together. The first body is developed by two people, and they are absorbed in intense pleasure.
However, Teppei, who has doubts about sex just for pleasure, begins to worry about the temperature difference between them.
At that time, Teppei also has a relationship with Kashii, his classmate who has confessed to me that he likes it.
The end of the distorted relationship of the childhood friends is the banquet loop yandere.