These two are off my bookmarks and I've read numerous times (a rarity for me). Too tired for embedding so here are urls.

This is a cute story, that plays off the new Hawkeye comic. Short, sweet and to the point.
http://www.fanfiction.net/s/8463766/1/A_Dog_With_No_Name

This is various ways the team finds out that Natasha and Clint are actually married. Hilarious and taxes are now a part of my extensive headcanon.
http://thoughts-to-ink.livejournal.com/769.html