-Him appearing out of nowhere to hug your from behind
-Dean always making ambiguous jokes whenever the two of you are together
-You having to explain every single one of those jokes to Cas, making this even more awkward than it already is
-Dean and Sam actually really liking you and Cas being together though, since they feel like he is a lot more at ease when he's around you
-You giving him cheesy nicknames
-Him not really understanding the concept of it and just calling you after things he likes ("taco", "waffle")
-Cas' brothers always teasing you about your relationship whenever they cross your way
-Crowley calling you "Mrs. Ducky" and always hitting on you when Cas is around, just to get on his nerves
-Cas making sure you know how much he loves every single thing about you
-Sometimes he'd stay the whole night in bed with you, just watching you sleep peacefully in his arms
-You kind of making it your goal to make him blush as much as possible
-Annoying everyone around you because of all the fluff
I got this from Tumblr, so it ain't mine.