Natasha Romanova (Avengers) & Parker (Leverage) - "That is not happening."

The Avengers discover that there are fans who write explicit RPF fic about them. Some of them are very confused. Some are proud. Some don't understand why everyone writes the pairings who aren't together but hardly anyone writes the couple who actually is together. Much silliness ensues.

Clint Barton's presidential campaign started as a joke. It didn't end that way, except for Steve.

They were in another timeline. It happened occasionally. Who even knew how Wade got involved. He was just trying to show Darcy how many tacos he could fit in his mouth (six), and then blammo: Big flash of light, whirling space vortex, the indescribable sensation of the universe contracting with you inside it to the size of a single electron, and then everybody was spat out in a heap on the sidewalk of a place that looked like -- but probably wasn’t -- New York, and all of Wade’s tacos de sesos were lost to the interdimensional void. “Nooo,” Wade whispered, heartbroken. “Tacos.”

fic where there is a supernatural threat to New York City and the Avengers show up to handle it but when they get there the Ghostbusters are already dusting off their hands and hosing off the slime