Day 1

Quick note about how this works: For each trope I'm only picking one fic I like a lot, but I'm not saying that one is my favorite. It would take a lot longer and I could never decide.

Day 1: Arranged marriage
Flag of Convenience (Hockey RPF), by cephalopody
Summary:When Poile offers to trade for a husband, Filip accepts the deal at face value, excited for the chance to settle down with someone and start to build a home. He should have read the fine print.
Preds fic, which is not a team I care much about, but imo no prior team-specific knowledge is necessary. I like this because of the wonderful angst (mind the warnings), and depending on your mood you can read the sequel, which has something of a resolution, or not.

Day 2

Day 2: Magic
A Clear and Different Light (SGA), by sholio and naye
Summary:Rodney McKay, raised by a pod of telepathic whales. John Sheppard, mage with fae blood. Teyla Emmagan, rune-scientist. Ronon Dex, winged soldier. On the waystation of Atlantis, they're about to become embroiled in an age-old war against a brutal enemy.
I knew after the first sentence of the summary that this was going to be fantastic, and it is. Great worldbuilding (especially the visuals), found family feelings, and h/c.
Bonus: there are several additional stories linked on AO3, and you can find accompanying art here.