Ok first fic is not really about the avengers it's about their kids. The avengers have all had kids and have hired a babysitter to watch them. The story is about what the babysitter goes through watching the kids while their parents are off saving the world. I remember that Clint and Natasha had a set of twins and that they are the oldest.
The second fic is about Steve and Jack Frost from the movie 'Rise of the Guardians'. If I recall the story is all told from Jack's point of view. Jack tells about the time he was in New York and meet Steve and how when the Steve crashed in to the ice Jack gave him a quick freeze instead of a slow one.
That's all i can remember.
Thanks for the help.
P.S. Mods: I wasn't sure what tags to use so I hope these are right.