A/N: Loki, Peter, and Bruce FTW!

In this story, Loki is more of a chaotic neutral figure. I tried to explain it a little but please tell me if it came off a little half-assed. Also, this chapter is almost double the length to make up for the fact that this is December 10 and I'm working on the fourth chapter.

Prompt: "Person A accidentally breaking all the Christmas ornaments while Person B watches, horrified."

Peter carefully wound the last of the popcorn strings around the branches of the Christmas tree in the living room. Suddenly, there was a flash of green light in the corner and Loki materialized.

"Hello," he said coolly as Peter spun around to stare at him.

"Uh, hi," Peter stuttered, tucking the end of the string into the tree. "What are you doing here?"

Loki shrugged, sauntering over to the Christmas tree. "Can't I come to wish everyone a merry Christmas?" he asked.

Peter was suddenly grateful for the fact he hadn't taken off his suit upon coming to the Tower. Even though his Spidey-sense wasn't going off, it might still come in handy. "Not really?" he said, aware it sounded more like a question than a statement.

"If you're worried about a fight, don't be," Loki said, staring at Peter like he could see right through him. "Your team of heroes and I have come to an…agreement of sorts." He took another step closer to the tree, looking over the decorations. "No world domination or invading armies or any of that, and in return I'm allowed to come and go as I please."

"Okay," Peter said, relaxing slightly. "So, what are you doing here?"

Loki turned to look at him, his eyes a brilliant green. "I would like to make a wager with you."

"Like a dare?" Peter asked.

"If you want to call it that," Loki said with a short nod.

Peter grinned, extending a hand. "Sure."

0o0o0

Bruce stared at himself in the reflection of the stainless-steel fridge. He had thought ugly Christmas sweaters were one tradition he could have dodged, but Bruce and Natasha had managed to produce six of them, slightly crooked patterns notwithstanding.

With a sigh, he pulled open the fridge and grabbed Thor's homemade eggnog. It was surprisingly good, even though the kitchen had ended up a disaster – somewhat like the cookies incident.

A loud series of thumps and crashes from the living room startled him into nearly spilling the eggnog. Taking a deep breath and forcing himself to stay calm, he ran around the corner against his better judgement.

In the living room, Peter was swinging around the room in his suit, chasing a small black cat. "Hi, Mr. Bruce!" he shouted, waving with one hand as he clung to the ceiling with the other.

"Peter, what is going on?" Bruce demanded, ducking as one of the ornaments from the tree flew past his head. The cat was nestled in the branches, staring at him with intense green eyes, and Bruce could almost swear it recognized him.

"Loki dared me," Peter explained as he prepared to jump towards the tree. "He said if I – " The last words were drowned out in Bruce's shout as Peter launched himself across the room towards the Douglas fir.

Bruce could only watch as the twelve-foot tree toppled to the floor in a thundering crash, scattering ornaments, popcorn, and branches everywhere. Peter jumped to the side, clinging to the wall and staring at the destruction with a sheepish expression.

"Oops."

Bruce stared at Peter for a long moment, ignoring the cat that crawled out from under the toppled tree. It looked at the both of them, shook its head, and then, with a wink and a swirl of green it transformed into a large raven and flew out the open window.

"Loki," Bruce muttered in recognition.

Peter nodded. "See, I told you, Mr. Bruce." In one swift motion, he jumped to the window. "I have to find Loki now, see you later!" he called over his shoulder, swinging out the window.

Left behind in the wreckage of the living room, Bruce sighed deeply and took a long sip of eggnog. This is going to be a long Christmas.