It Was Summer In The Country, And I Was A Cherry Boy, And My Older Cousin Made A Joke, And I Took It Seriously, And Continuously Creampie Fucked Her The Peachy Clan Vol.18 Iori Kogawa (2020)

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.