Takeshi is a "butt fetish", he finally found the perfect pair of buttocks, which are the buttocks of... Riko, Satori's best friend, his girlfriend. Perfect buttocks from color, shape, size to round tension. Takeshi subconsciously becomes a stalker on his girlfriend's best friend, tails and secretly takes pictures of Riko's buttocks, using those photos to masturbate. And like the divine epiphany, a thousand-year opportunity suddenly appeared. Because she had forgotten her things, Riko went to their house to look for things while Satori wasn't here. Unable to resist Riko's charming buttocks, Takeshi seemed to have lost his mind, rushing to "invade" these buttocks! Although Riko always stopped her, her body was constantly "watery", as if to denounce her. After a few sneaky fucks with Takeshi, Riko gradually stopped being angry with him, and she even managed to get him to enjoy the pleasure even more...