So what with the discussion of MPREG, I was sifting through my Torchwood bookmarks and stumbled across this:
A Funny Thing Happened on the Way to Cardiff
Relatively short, not overly dramatic, featuring a Jack and Ianto who react exactly as they would on the show, a team who behaves perfectly in character (I love Owen in this) and a very neat surprise ending.
A good example of how MPREG can be done well without turning either partner into a whiny, hormonal mess.