Derek snorts when his nose is suddenly flicked, because who dares, but he is distracted by Dean's struggle. He's all tangled up in his shirt, which is tight around Derek's head, so he turns to dig his teeth into the fabric and tear. The shirt falls open, freeing both Dean and himself, and Derek lets out a satisfied huff.

Dean's hands are still in his fur and Derek rubs against him eagerly, completely ignoring Castiel and looking at the pie instead. He's eaten far dirtier things in this form, and his tail thumps against Dean's thigh a few times.