Loki & Peter
"You too," Peter said, honestly meaning it. He hadn’t forgotten the Chitauri attack, but it was what Loki did now that Peter found important. He’d dealt with enough villains on the streets of New York to know that only a small percentage were truly evil at heart - and the rest were just people who’d made wrong choices in a bad circumstance, people who’s lives might have been so much different if someone had given them a chance.
Peter filed the information Loki gave on his own experience with particle generators, making a mental note to check in with Tony about it. If there was any stone left unturned there, Peter wouldn't let their trouble be all for nothing.
"Oh trust me, if I run into any art thieves, you'll be the first one I call," Peter promised, holding his knuckles out for a good old fist-bump. "You might need to take the stabbiness down a notch, but we can work with that..."