The Fake Boyfriend

Castiel Novak has become accustomed to dealing with angry men over his brother's latest conquests, but this one takes the cake. Dean Winchester's brother is only friends with Gabriel, for one, and for another this strange man wants to do something absolutely ridiculous-
Pretend to date Castiel to ruin their brothers' relationship.

Castiel wants to say no but he is a broke college student and the offer of free food for at least a semester is just too good of an opportunity to pass up.