Kamisama choose! Sensei Onna no Ko Niatteru Yo!

"I'm an angel. A real one."

The pretty, pale-skinned crossdresser, "Shirahato Inori," said that.
Floating next to him was a plushie-like creature he called "God."
Inori made money as an "angel" by granting wishes with God's power.
But to grant those wishes, he had to have sex with men and offer up the semen they pumped out inside him to God.
His homeroom teacher, Okihi Kanae, tried to stop Inori's "angel work," but Inori lost it and turned Kanae into a schoolgirl.

"Ahaha! This is awesome!"
"If you’re so worried about me, why not do my job yourself like that?!"

But Kanae didn’t back down.

"If I do that... will you come back to school?"

And so the teacher-turned-schoolgirl and the angel-crossdresser ended up living out their school days together—as classmates.

Translated from the official website