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The demon king and Barbatos are dating behind everyone's back
They were dating before Diavolo was born but had to break up because Dk had to choose between his Barb and his wife, he choose his wife
After she died and Diavolo was born Dk tried to go back to Barbatos but my he wasn't having any of that drama
But despite this Barbatos still kept in contact with him, cause well, even if they aren't fucking they're still really close (Barbatos refused to come to the castle)
The original reason Barb came to the castle was because after eons of cock blocking Dk he finally said yes, then he met Diavolo for the first time (Diavolo still being a child at this point)
After Barbatos became Diavolo's butler Dk was confused and lowkey upset but tried to get with with him like 6 second later, to which Barbatos said no
After seeing the lowkey child neglect that was going on Barbatos decided that they probably could never be a real couple like they once were, I mean, what if they have a baby? Would Dk treat them like shit too? Even if he did, wouldn't that be fucked up for Diavolo to see?
But turns out that no was a fucking lie, cause they did end up dating actually
Anyways that's my fanfic outline, straight from the Google doc