Suggestions for a Femdom story?

So not long ago I wrote an erotic story for my fiancé, and she absolutely loved it! Her reaction inspired me to whip up another one for her. As the title of this post suggests, I want the themes to revolve around femdom and F/M corruption. Specifically, it’s in a fantasy setting where a thief gets caught by a dark Paladin who proceeds to dominate and corrupt him into becoming her mindless sex toy/pet. However, every time I try to brainstorm what I want it to look like, I come up blank. Are there any experienced readers or authors here who are willing to give me some suggestions?