Not a word Castiel applies to himself generally either. But there are moments when he craves Sam's cock, and in those moments he knows what society would call his behavior. He'd never condone anyone saying it out loud, of course, and doesn't think it bad. No, it just means he thoroughly enjoys and wants Sam.

"N-not... an angel anymore..." he gasps, toes curling and headboard rattling as he pulls on it, white hot pleasure shooting up his spine and making his voice break.