Getting Back Together Is Madness

What is the one rule ex-lovers must absolutely keep?
There are many—don’t contact each other at dawn, don’t call their name when drunk, throw away anything you used together—but among them, isn’t this the one that must never be broken?
Never sleep with your ex.
…And yet.

“The one cursed with the ‘Name’ spell. That’s you, isn’t it?”
“Yes.”

‘Name’.
A curse that turns the entire body stiff like stone.
Its defining trait is that ‘someone’s name’ is engraved near the chest of the one afflicted.
There are only two ways to remove it.
Break the curse…or sleep with the person whose name is engraved.

“So. Whose ‘Name’ do you have?”

Feeling a bad premonition, Beatrice stared straight at the man. Within her sight stood the former lover she had broken up with years ago, smiling crookedly.
Erich raised his hand, pointed exactly at her.

“You.”