Turns out interrupting a battle between two super powered mischief gods isn't a good idea. Cue amongst other things, curses in rhyme, gender bending, de-aging, invisibility, animal transfiguration, and a helicarrier full of monkeys. Pepper/Tony with eventual oddly sense making and adorable Tony/Loki/Pepper. It works a lot better than Bruce/Natasha in AoU anyway.