Hmm. Well, if your up to speed on SPN (which you seem to be if you have seen that one) then perhaps something with castiel and Dean.

It can be gen, perhaps Dean telling Castiel that humans don't do that or teach him something humans take for granted. off course, Sam can be around too and be all *raised eyebrow*. lol.

I'd love Castiel/Dean, but it doesn't have to be at all.

Was that complicated enough? lol.

(I'm obsessed with Castiel. XD and Misha Collins, who plays him. lol.)