Show me how

Being the little sister to the Winchester's means a few things.
1: You know how to use a gun, fight and drink anyone under the table
2: Older brothers=overprotective aholes a lot of the times
and finally
3: NO MEN! Especially blue eyed angel ones

reader/Castiel(will take place after Dean comes back from hell, will probably skip a few things just so we can get to the good stuff*wink wink*)

unfortunately I don't own supernatural but I will use them to make my own story