Unhinged posessive MMC and she LOVES it

Plot/Romance balance doesn't matter.
Him being an unhinged "hording dragon" and she's enjoying it, without any remorse.
He can do unspeakable things, and she'll be just - well, you all should've thought better.

Not a contemporary romance, pls.
Let him be at least 70% humanoid. I'm not really into monsters (yet)
No violence against her. She is his precious perfect treasure.

I tried searching, x-raying reddit, but i don't really know how to search something like this.
A relationship dynamics is what matters to me, everything could be anything, i'm not picky.

If it's a questionable book, your little guilty pleasure - I want it