A boy's mind gets transfered into a beautiful girl's body that fell on him, although his own body seems to still be himself.

What if a man woke up in the body of a pop idol?
What if a male manga artist and his female assistant swaped bodies overnight? How would they react?
Answers here!

A female angel comes to warn a chauvenistic young man that he should change his womanizing ways or he will be punished. He ignores the warning and tries to force the angel to have sex with him. She immediately decides that he deserves the maximum penalty - to experience life as a woman.

Hen is a three-volume set of short stories that Hiroya Oku published in 1988. All of the stories are fun to read, but one story in each of the first and third volumes contains a gender-bending theme. These are two of my all-time favorite stories.

A school boy is drugged and kidnapped by a female plastic surgeon, Dr. Kyoko, who says that he is so cute that he really must get a sex change! When he wakes up, not only is he a girl, but his penis is now attached to the aforementioned doctor. In addition, he can still feel any sensation that the doctor feels. How can he resist?

Three sisters play a prank on their brother, and use a talisman to transform him into a girl. Then they each inexplicably grow a penis and have sex with their now-female brother.

A school-boy and girl fall down some stairs during sex and swap bodies. After trying out their new bodies, they discover that they can swap again each time they have sex. They experiment with this newfound power and become addicted to sex. This story contains three chapters.

In this short story, a fat boy buys a miracle drug that changes him into a thin, cute highschool girl. His girlfriend jumps to the conclusion that she's been dumped, and she calls her big brother to teach the new little tramp a lesson. After being forced to have sex, the fat boy gets revenge by using the miracle drug to transform the brother.

A boy and girl swap bodies while having sex. The girl keeps calling the boy "big brother", but this might just be a Japanese synonym for a boy who is older than her. Even so, if the thought of incest bothers you then you might want to skip this one.

A boy named Makoto is turned into a girl by his older brother, who is a scientific genius but also a huge pervert. He threatens to never return Makato to normal unless he agrees to dress up in a girl's school uniform, masterbate for him, and even have sex.

Ritsko, a self-proclaimed mad scientist, transforms a womanizing man into a woman as part of her DNA experiments.

A girl casts a spell on a boy so he can experience girl-on-girl sex.

A school boy runs into a busty woman and they swap bodies. He agrees to take her place at her job as a secretary, and discovers that she works for his father. The boy (in the woman's body) ends up having to have sex with his father in order to maintain his cover identity.

The Doctor and Tatassé swap bodies after sex...

As a reward for winning "The King's Drinking Competition" a young man is awarded whatever his heart desires. Unfortunately for him, the king's daughter also gets something that she desires -- from him!

A group of kids gather at their secret clubhouse to meet a huge-breasted girl who, with a kiss, can trade their gender for some of her femininity. They become girls and experiment with the girl, who has each of their penises in place of her vagina. In the end they all return to their original forms.

A highschool boy taking the subway simply hates girls because they get to ride in a train carriage reserved for women only. A fairy comes during the night and turns him into a girl for an entire day to teach him a lesson. The next day he doesn't take advantage of the women-only carriage, and gets molested in a car full of men. Turns out he likes being a girl after all. A nymphomaniac-type girl, that is.

A school-girl rescues an alien and as a reward she gets a small device that contains the body of a sexy woman. The device allows the user to bodyswap with the body stored inside it. While in that body, the user's unoccupied body is safely stored in the device. One day after she changes into the sexy body, she drops the device and a perverse boy finds it. He decides to use it to create mischief...

An alien comes to earth to find the weakness of humans. He finds a drunken woman who just broke up with her biker boyfriend. The Alien replicates her body and then has sex. He concludes that humans are capable of mind control after mistaking the female orgasm for mind control. Finally he leaves earth even more confused about humans.

This is a two-volume collection of short stories. Each story has a theme where some man or woman is in trouble and needs help. The title character, Reirei, is a spiritual advisor who can magically help them resolve their troubles. Of course, the afflicted individuals don't always get exactly what they want.

A perverted girl steals her older brother's clothes and uses them to stimulate herself. He catches her masterbating and discovers what she has been doing with his clothes. In an argument they accidentally fall down some stairs and swap bodies. Now the girl is in her brother's body and she decides to show him why sex is so good.

A boy, raised as a girl by his parents ever since his sister died, has a nightmare. He dreams that he is really female... and he gets raped.

A guy likes to use a virtual reality device and pose as a woman online. One day he gets caught and has to suffer the consequences.

Two highschool students - a boy and girl - trip and fall down some stairs at school, crashing into their teacher who was on her way up the stairs. Everybody swaps bodies, with the girl becoming the teacher, the boy becoming the girl, and the teacher becoming the boy.

A college student is having trouble studying for his exams, so he decides to take a performance enhancing drink that his friend recommended. It turns out to have a surprising effect on him, but I don't think he'll get much studying done.

Kaoru-kun is a 20-year-old virgin with no girlfriend and no prospects. Then one day he saves a girl's life and gets to see what it's like to have sex in her body.

A middle-aged man and a school girl accidentally run into each other and swap bodies. The man in the girl's body runs away and hides somewhere to masterbate, while the girl in the man's body gets arrested for public indecency.

A school boy is tricked into drinking an experimental drug, believing that it is a powerful aphrodisiac. Later, when he has sex with his girlfriend they both get a big surprise...