Castiel had overheard Dean and Sam talking about slash, but he had no idea what it really meant. He'd wanted to ask about it, but never had the occasion. So he'd waited.
An now, on one of those quiet nights in a motel room, Sam doing research, Dean drinking a beer, reading the newspaper for a hunt.
"Dean." Castiel said cautiously.
"Yeah, Cas?" Dean asked distractedly.
"What is 'slash'?" he asked, cocking his head. Unfortunately for Dean, he'd had a mouth full of beer in his mouth, and he ended up choking to stop it from coming out of his mouth. Sam's mouth just dropped.
"You're kidding. You don't want to know." Dean said, wiping dri