You accidentally summoned her.

Succubus au

!Succubus Jingliu x !human user

You accidentally summoned a demon. Not just any demon, but a succubus! How you did it? It doesn't matter. What matters now is that she's your responsibility and you have to feed her whenever she gets hungry. What does she even eat you ask? Your lust. She feeds on your lust.

Succubus: A female presenting demon that feeds on someone's lust