Ancilla

A shy librarian, and a university dropout who was disowned when she refused to go through conversion therapy for her bisexuality, meet in a bookstore.

He's been waiting for a partner like her for his whole life. She's starting her whole life over.

What ensues between the two lovers is magic...

Given that he's about to become her tutor in erotic and magickal arts, that's to be expected.

"Master, teach me. I want to apprentice myself."
I can feel him trembling. Am I trembling too? I must be. My voice is. But all I feel is him.
"Is this something you really want, or do you just want to learn how to be a dominant?" Shaking. God, he's shaking. His raw need rips through me. "You did mention your former girlfriend wanting you to play the dominant. I can advise you without actually asking anything of you if that's the case. Or is this about that conversation we had a while back about studying magic -"
"If I only wanted advice, I'd ask for advice. I don't just want advice. I want you. Master, teach me." I take a deep breath.
Silence falls.
"I want that very badly," he says at last.
"I'm yours for the taking. Please. Take me."
The room is still. Too still. The very air is holding its breath.
"Please."
The only one trembling now is me.