夏の田舎で童貞の僕は年上従姉の冗談を真に受け、中出しし続けた。 桃色かぞくVOL.18 古川いおり

This younger guy spends the summer with some relatives in the Japanese countryside. There, she is with her cousin Akemi (Iori Kogawa), who mocks him for being a hopeless virgin, and taunts him inviting him to “put just the tip inside her”. He took her cousin joke seriously though.