Ran, the childhood friend who dresses as a boy, constantly hangs out in the protagonist's room in this single-mother household. Though she's always acted like a guy, he's recently started noticing her budding chest and subtle changes in her expression, slowly realizing she's actually a girl. Even though she looks male on the outside, her body is unmistakably feminine once she undresses. Her large glans are super sensitive—just licking it makes her tremble, and once his cock enters her, she instantly transforms into a slutty female. Despite her shyness during the intense thrusting, she moans like a true slut, climaxing over and over. Unable to resist the pleasure of sex, Ran goes wild, frantically grinding her hips and turning into an insatiable nympho. What should he do? Sex feels so damn good!