YIPPEE cain-faust is actually one of my number one I Wish This Was A Relationship Cain Had For Real concepts!! they have a whole lot in common what with them being ex-central military figures that go out of their way to talk as little to others about themselves as possible, and i think that cain having someone who can like...understand what he's doing without also trying to pry more out of him (the way owen does) or disapprove of it (as arthur and akira do) would give him a space to just freaking relax for once in his god dang life

there's a home screen line that talks abt how after the big catastrophe that was the calamity night just before akira arrived in their world, cain checked up on faust every morning to make sure he was doing alright. and while less common, faust comes to check up on cain when he misses breakfast, and i think it's a very simple and sweet expression of sympathy that allows both of them to have their boundaries respected while also like...being seen for all of themself if that makes sense, and that's something that's very important to me in relationships of any kind

there's also my whole alecfau rpf cain headcanon but like. you know