It would seem that it is fan art from a novel called "Romance of the Three Kingdoms" and I don't know any more. I also feel like a story would be worth reading based on this image alone. This is where I got it from: https://www.zerochan.net/Romance+of+the+Three+Kingdoms
and I don't know anything about the story, but it's possible the original is not BL but some people wish it was. It certainly should be.
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