Anything where the MC is the liege and has a romantic or close relationship with their "knight"... doesn't need to be royalty setting, can just be loyal subordinate. BL, GL, or BG is fine! I do like BL. I prefer it to be a subplot instead of the main focus, since I love plot heavy novels. Published novels or webnovels OK!
World of Cultivation, maybe? It's definitely more plot-heavy (even with such a funny MC), and quite a slowburn, but I found their relationship quite moving. The story is complete, so that's also a plus. You might also like Devil Venerable Also Wants to Know, it's a leader/subordinate story, but I haven't read much of it yet, so I don't really know how will it turn out...