I did this for withafinalbreath on tumblr as my piece for The Secret Santas of Olympus. The other half of the gift is the cover (reindeer!Percy).

"I will murder you Valdez!" Nico yelled at me. He sounded angry. And I didn't doubt his ability to kill me, seeing how he's the son of the death god, and all.
"Gotta catch me first," I taunted, laughing maniacally as I ran away from him.
I looked over my shoulder and saw a horrified look go over his face.
"Leo watch-"
I slipped and fell, hitting my elbow on the icy ground.
"-out," he finished.
I barely heard him over the pain radiating from my elbow. I saw him start to walk towards me. and then I blacked out.

"So he's going to be fine?"
"Yes Nico, for the hundredth time, Leo is going to be fine."
I opened my eyes to see Nico talking to Will Solace.
"Ok, I guess I'll let you get back to Jake (Mason) now."
"Have a great Christmas," Will said, waving.
"Use protection," I called.
"Shut up," Will stammered, blushing.
"Everyone knows you're dating my brother, and it's nothing to be embarrassed about."
"Goodbye Leo."
"You two have fun now."
"We will," he replied, winking.

"Why did you hit me in the head with a snow ball, anyway?" Nico asked me as we were walking back to his cabin.
"Because you need to get into the holiday spirit," I replied.
"Well, how about instead of further exposing yourself to injuries, we do something safer, like baking Christmas cookies."
I looked up. "Cookies?"
"Yep."
"Yay!"
"Calm down, you don't want to hurt yourself again."
"Fine."
We headed back to his cabin to get started on our holiday baking.

"I think you're supposed to use baking powder , not baking soda."
"Leo, there is literally no difference."
"Yes there is."
"No there isn't."
"Do you want our cookies to taste like something that came out of the wrong end of a hellhound?"
"It's not going to taste any different."
I shoved a spoonful of baking powder into his mouth.
"Why did you-" he sputtered, spitting powder out. I shoved a spoonful of baking soda in next. He spit it out.
"See," I teased, "they both taste different."
"They both taste like shit."
I gave him a look.
"Ok, ok. I surrender. They taste like two different kinds of shit."
I turned around to grab the flour, when I felt something wet and gooey on my head. I reached up and touched it.
"What the Hades Nico? Why would you smash an egg on my head?"
"Payback," he said, grinning.

After the cookies were baked, we settled in on his comfy couch with a plate of cookies and a cheesy Christmas movie.
I cuddled into his side. He wrapped his arm around me. He leanned towards me, and I swear to the gods I thought he was going to kiss me.
Instead, he just took a huge bite out of the cookie that was halfway in my mouth.
"Merry Christmas Leo."
"Merry Christmas Nico."