Are We Any Different?

Cas adopts (steals) a cow. Dean helps. ("Cas… There's a… There's a cow. In my room." "Yes, Dean." "Why?" "Because." "Right.")... aka the ol' "my landlord won't let me get a fish because of a no animals policy, so I adopted a cow instead, and my roommate has to help me hide it" fic trope…. Wait, that's not a trope? (Written with LeviathanBlue on AO3)