I am pretty much out of it today (but I will write if there's a way to make myself); instead I can give you awww inducing things I've worked on (you could easily call me Miss Babyfic.)

My fanfic writing for this pairing started with a story called Kobayashi Maru (http://archiveofourown.org/works/465017), which is a rather big babyfic and should provide you with aww moments featuring entire team. I wrote several stories in that same 'verse, and you can find them here (http://head-on-home.livejournal.com/tag/kobayashi%20verse), and an additional one that's only on AO3, called Effects of maternity (http://archiveofourown.org/works/484209); in which Natasha is a badass mommy. Other baby and kid fics? Only human (http://head-on-home.livejournal.com/17204.html) where I tried to flip a trope of Natasha not wanting a baby on its head and Learning to play the song in your heart part one (http://head-on-home.livejournal.com/20908.html) and part two (http://head-on-home.livejournal.com/20993.html), in which natasha decides to keep an unplanned pregnancy, and Clint decides he will help her as much as he can. Only it's harder than he expected. (That one is slightly unconventional approach to babyfic, because Clint isn't the baby's biological father, and no, Natasha didn't cheat on him, and it's more complicated than it seems based on this summary.)

There's another kidfic series I was working on called Random numbers (http://head-on-home.livejournal.com/tag/series%3A%20random%20numbers), which was Castle/Avengers crossover and Clint had a kid with... well, go and check it out if you want. It's not finished, and maybe I should really go back to that thing. :D

Among other works, I can offer you Adagio, allegro (http://archiveofourown.org/works/826531) for awwwws. Cuddling while playing a cello, why not?