Castiel could think of nothing that he had ever enjoyed watching as much as that and Cas had seen the whole of Creation so far. He looked down at Dean, covered in a mixture of their cum, possessively. Dean was his and any celestial being that had an issue with that could fall for all he cared.
After a long moment, Castiel had recovered enough to find his voice at least.
"Go get yourself cleaned up" he nodded, suddenly feeling awkward and not quite sure what to do.