As it turns out, Dean moved in with Castiel, as his apartment was larger. Or, well, it looked larger. He didn't have many possessions, so it gave the false impression of extra space. That all changed when Dean took up residence.
Dean didn't have many things either. However, as he shared an apartment with his younger brother Sam, their place seemed small. The addition of Dean's to Cas's things left them both bumping against furniture and each other.
And for three months, they dealt with it. After all, Cas lived in a more strategically placed area and Sam got his own space for the next couple months. At least they didn't have to worry about being quiet anymore, since Sam wasn't in the next rom.
It was great until they had five people over at once.
Castiel's birthday fell on a sweltering summer Saturday. Sam had been the first to arrive, beer in one hand and messily wrapped present in the other. Jo was next, shortly followed by Balthazar, Anna, and Rachel.
Gabriel was fashionably late with an oversized cake. "Happy Birthday Cassie!" was drawn in blue icing beside a rather unflattering picture of Cas. Before that day, he could've said he'd never been confronted with his own stare. And, okay, he had to admit it was a little disconcerting.
An hour later, cake devoured and presents opened, the group was gathering in front of the TV (They'd decided to keep Castiel's flat screen, leaving Dean's pawnshop find with Sam) to find something of entertainment. At least, Cas tried to get them all to watch TV so his siblings wouldn't bring out the embarrassing childhood stories.
Castiel and Dean owned a couch, an armchair, and two kitchen chairs. And, instead of retrieving on of said kitchen chairs ("But they're so uncomfortable!"), Gabriel plopped himself down in Sam's lap.
Dean decided the place really was too small for them. And, no, he wasn't paying attention to the fact that Gabe spent the remainder of his visit on his human chair. Or that Sam didn't complain.