The Angel and The Fallen [WIP]

Everything about this a work in progress, but I'm looking for opinions and feedback so here I am
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horrible summary of everything:

An angel and a fallen (henceforth called a demon because it's easier) have been in a relationship for most of existance until the demon fell. At some point after that they meet again and fall into old habits, but their relationship isn't quite as healthy as it once was but their lonely. Blah blah blah story stuff that's boring in a summary because slice of life doesn't work well with summaries, much less WIP slice of life, blah blah blah. They two rise up the ranks in their respective kingdoms which in turn makes their relationship much more tense and rather toxic but it's hard to break habits. And I'm not entirely sure what I want to happen when someone inevitably finds out because work in progress