Well for the fantasy part I recommend King's Maker. Although the "yaoi" parts are really slow so you need to be patient with that one. For the action and BDSM I recommend Killing Stalking. Although that one is really extreme with it's gore. So you might want to do some research before reading it. And something similar to the "being kept by someone" part, then I recommend Hogu Hagyeongsu. That one is super interesting!
Sorry if it's too much, but hopefully you'll read one of them ^^
Thank you. I have read both kings maker and killing stalking but not hogu hayeongsu.
Do any of you have any yaoi manga similar to blood bank or royal servant