In terms of a scheming MC in a western BL fantasy that I can think of is: The Show Must Go On As for just western BL fantasy in general it’s not to hard to find them if you go to the series finder and look up yaoi or shounen ai while blocking out the eastern fantasy stuff like xianxia. However I will recommend a few to save some trouble: Nurturing the Hero to Avoid Death I Reincarnated as the Villain in an Eroge, But Before I Realized, I Became a Capture Target This Delusional Voice Keeps Telling Me I’m a Villain My New Life, Won’t You Please Become Peaceful! There are plenty others, but I am currently exploring such stories myself, so I am only recommending the ones I’ve read and liked. I hope this helped ^_^