That was way too big a bill for Cas to wave up there, but damned if it didn't get the dancer's attention. In a big way. Dean sticks his fingers into his mouth and wolf-whistles his approval, as do a handful of other men near the stage. Because, hey, he's happy for Cas, he really is. Even nerdy little angels deserve to get a kiss from a hot chick now and again, right? Yes, Dean certainly didn't have a moment of panic when the dancer grabbed Cas. Of course not. Dean Winchester does not panic.