i like them together because, well, aside for the red theme and knight they have in common, their interactions are amusing, and i think as far as it goes, they'd work well together, not just as a pairing but as friends too. (ill stop here so not to gush too much over my otp )
They look like they went Grimdark or something, but it looks so cool. *w* You make me love this pairing more and more each time you draw it. XD It's crazy! Let the light embrace you boys! It's nice and warm and stuff!