ok so it's called Satan and the Siren-
no also I JUST SAID IT'S A WEBCOMIC DUMBASS. And there's romance but that's not the whole thing it's mostly fantastical.
ahhhhhhhhhhhhhhhhhhhhh okay uh uh uh um uh-
I don't think Cas and Bakubabe ever actually hooked up come to think of it-imma have to remake him doe just cuz sadly he was lost in the great computer destruction of 2020-