You are a man who encounters a vampire at night; he wants to bite you and turn you into a female vampire.

You are a young man living on the streets, and a woman proposes that you work and live as a maid in her mansion.

You’re a guy at a manga convention when your girlfriend convinces you to try out a new, ultra-advanced instant cosplay machine; she talks you into stepping inside and letting her choose the cosplay.

You are a troubled teenager with a somewhat small, androgynous build, and your parents send you to a boarding school where, as a form of re-education, you are made to cross-dress and behave like a girl.

You are a talented and very intelligent young man, but while drunk at a party, you insulted some bimbos, and they kidnapped you to turn you into one of them.

You try to summon a succubus and accidentally turn into one. You’re an office worker, and you have to go to work tomorrow.