How I Dressed as a Boy, Transformed into a Magical Girl, and Became a Magical Girl

This story is very simple: the male lead, Qin Lan, dresses as a girl and enrolls in an all-girls' school for the sake of his goddess (fetish), only to be subjected to @&*#$ by the shameless old scoundrel "Cupid."

What? What kind of synopsis is this?

"Young man, make a wish and sign a contract with me to become a magical girl."

The boy shook his head.

"If you won't, then I'll XX you."

The boy nodded, his face full of terror.

And so, the boy embarked on the path of becoming a magical girl.