after cas moves into the bunker, he starts to notice that dean leaves his cellphone literally everywhere. cas is getting real sick of keeping track of the thing himself, so he starts taking about 30 selfies all in quick succession every time he finds dean’s phone just lying around. dean never says anything about it, so cas assumes he just never looks at his pictures.
until one day sam is the one to find dean’s phone and when he sees the literal hundreds of selfies of cas making variations of the same serious face, dean’s only explanation is, “what? i think they’re cute.”
and now cas is wondering just how long dean’s been “losing” his phone on purpose.