Enslaved By Magic by Kessily Lewel

Luke is her only chance at freedom.

To save her family she signed a dark deal. Now she lives a cursed life. Immortal, unchanging, but bound by magic to serve anyone who owns her bottle. She must fill their darkest desires until they set her free— only no one ever does. She had given up hope until Luke claimed her bottle and then her heart by treating her like a woman instead of property.
Amari quickly learns there are penalties for crossing his boundaries, but there are also rewards she hadn’t expected. The chemistry between them is electric. They seem fated to be together. There’s just one problem … Amari can’t truly trust him until she has her freedom. And freeing her means he has to let her go with no guarantee she’ll come back to him.