So I'm being a crazywoman here and found a list of one hundred prompts and I am going to use all of them! XD
I am determined to do one hundred Harry Potter one-shots, all varying in characters, era, and whatnot. Feel free to suggest ideas! XDD
Here's the list:
community (dot) livejournal (dot) com/fanfic100/profile

Title: Will You Marry Me?
Characters: James and Lily
Prompt: Beginnings

"Padfoot, you have to help me!" James Potter was frantically talking to his best friend via the Floo Network. His face was covered in flour and his unruly hair was even more of a mess.

"Merlin, James," said Sirius through bouts of hysterical laughing. "What in the world are you trying to do?" James scowled.

"Stop laughing and just get over here!" he cried, frustrated. "I'm trying to bake a cake for Lily!"

At this, Sirius just couldn't take it anymore. He rolled onto the floor, roaring with laughter. "You!" Sirius held his sides. "Bake a cake? Now that's something I'd like to see!"

"And you will, because you're coming over here to help me." James was, to say the least, mildly angry that his mate wasn't taking this seriously. Sirius's laughs are starting to slow by the slightest. "Right?" asked James pointedly.

"Sure, sure, Prongs," Sirius said, a puppy-like grin on his face. "I'll be right there."

James pulled his head out of the fireplace and walked into the kitchen. There was flour covering the counter, an egg splattered on the floor, and cocoa powder nearly everywhere except the mixing bowl. He sighed and tried to brush some of the flour off of his clothing and face.

With a pop, Sirius appeared in the doorway to the kitchen and upon seeing the crime scene, he burst into laughter again. "Why in the name of Merlin's pants are you attempting to bake a cake?"

"Shut it, Padfoot." James said, annoyed yet again. "I told you, it's for Lily."

"Can't Lily make her own cake?"

"As a matter of fact, she can't," James turned to face Sirius, "because I am planning on proposing to her tonight."

This sobered up Sirius right away. "Really, James?" He grinned widely. "Well congratulations, then, mate! What are we waiting for? Let's get started on this damn cake!"

An hour and a half later, the boys heard a key in the front door lock. And they panicked. The cake had just gotten out of the oven, seeing as neither of them knew any cooking spells, and they were attempting to frost it by hand. James was also adamant about writing, "Will you marry me?" in flowy, pink frosting, which they obviously didn't have time for.

"Hurry up, Sirius!" James was frantic now. He had wanted this to be perfect.

"I'm trying! Go distract her!" Sirius pushed James out of the way and continued frosting the cake like a madman.

"James? I'm home!" He quickly walked into the living room where Lily was standing and tried to act normal.

"Oh, hi there, Lils." Her eyes were sparkling with happiness and her hair was tousled from the wind. She giggled.

"Do I dare ask why you are covered from head to toe in flour?" She hugged him and gave him a quick peck on the cheek before taking off her now flour-dusted coat.

"Um… Long story," he said, his cheeks turning slightly red. "Anyways, how was your day?"

Lily smiled and was just about to answer when they heard a loud, "Bloody hell!" from the kitchen. Lily raised an eyebrow at James, and then made her way to see what was going on.

She walked in to find the kitchen an absolute mess, and Sirius desperately trying to keep the half-frosted cake from collapsing. "Okay, what is going on here, you two?" She was a little upset that her kitchen was in this state, but it was hard to be mad at her two best friends.

James walked over to the cake, looked at it, and then proceeded to smack Sirius on the back of the head. "Thanks, mate, so much for that." Then he turned to Lily. "Lily, I-"

Sirius interrupted him. "The ring, man," he whispered in his ear. "Get the ring. Forget the cake!"

"Right. That would work." James reached into his pocket. No ring. He tried the other pocket. No ring. "Uh-oh." He pulled out his wand and said, "Accio Ring." And it came zooming out of the destroyed cake. Wish a sheepish smile, he blew the crumbs off of it, knelt down right in the middle of the flour-covered floor and presented the ring to the love of his life.

"Oh, James," she whispered, astonished.

"Um, I was going to make a cake, but that didn't quite work, as you can see." He smiled his heart-melting smile at her. "But Lily, even though I don't seem to be the best cook, will you marry me?"

Lily grinned and let him slip the ring onto her finger. "Of course, you silly man. Of course!"

James stood up and wrapped his fiancée in a big hug, and then kissed her passionately with their best friend watching.