Izumi Nagai (いずみ 永井) was just an ordinary, unsubstantial high school student until the day that she found, on her body, above her girl parts, there was a small growth that was almost unnoticeable and sensitive to the touch. She touched it, and rubbed it, and played with it, and it swelled and grew until she realized that she had grown a penis and testicles.

She was so embarrassed, and secretly so enamored with her new parts, that she didn't tell anyone about them. She spent many nights at home playing with herself, and many breaks in the middle of the day at school to go to the bathroom and drain her fresh-formed balls. Her balls and cock continued to grow with every passing day and every new way she found to tease out her cum, until the day that she was caught.

Izumi was being particularly loud while pleasuring herself in the girl's bathroom; she thought she was alone. Suddenly there was a [i]smash,[/i] and in the moment where she was releasing load after load of creamy, thick cum for the fourth time that day, a small group of girls barged into the bathroom and found her, unable to conceal her quivering member and clean off the ropes and pools of semen on her uniform and the floor.

They had expected some perverted male student sneaking into their bathroom and doing something when he thought no one was around, not Izumi. One of the girls was her classmate, and had thought Izumi was acting strange recently. She never could have predicted this. Who would think that the strange girl constantly shifting around awkwardly in her seat and asking to use the bathroom at least three times a day was just taking a break to stroke her massive cock?

At first they were surprised, but this quickly turned to curiosity, and eventually to impulsion. They grabbed Izumi, felt her, stripped her, and photographed her.

From then on, Izumi belonged to those girls. It started with watching her touch herself. When they got bored with that, they touched her cock and balls [i]for[/i] her. It evolved into sucking, and eventually fucking. If Izumi refused to do anything they said, they would reveal her secret. Seeing that they had already gone so far, the girls decided to take their operation to the next level and started loaning Izumi out to other girls in the school, for a price of course. This evolved from just their closest friends, in confidence, to any girl they could find that was willing to pay them for something "new" and "fun."

These days, Izumi spends a great portion of her days being led around and pimped out by any of the girls who had originally known her secret, finding a place in the bathrooms, locker rooms, storage rooms, roof, the library, and even outside the school on the weekends, to use her thick, delicious cock and endless stamina to pleasure any girl who can pay the relatively cheap price of admission, and occasionally giving herself to one of her coercers (for free of course, though Izumi hasn't made a single yen off of this arrangement anyway).