Weeks Of Bliss (aka: A hundred bad mornings, and how they still turned out awesome, anyways)
They're finally dating. Finally. Who'd have guessed? Certainly not them. Okay, so, how is this going to work out, now?
This is set between "Love, Dreams, Impending End of the World, and other minor problems" and the sequel to that (not yet published). It's mostly a plotless pile of fluff and smut, to give the boys a chance to figure things out between them and work on their new relationship with each other.
Reading the previous works (starting with the Advent Calendar) is highly recommended.