a/n: Just a shoutout to RanMouri82 for reviewing my story and really encouraging me to write. Thanks!

Disclaimer: No, I don't own Detective Conan.

Prompt: Key

Find out what this key is for

I'll be waiting by our door

Hurry. I need you.

~Makoto.

Sonoko stared at the note that had been waiting by her door. With it came an intricate wooden key with a handle the shape of a heart and small carvings the shape of vines twining themselves up and down the key. She bit her lip in worry.

I need you.

What in the world would Makoto need her for? What could she do for him that he couldn't possibly do himself? Makoto never asked for help. Not even when he didn't know what to do. Her red handkerchief incident a few years back taught her that. Yep, he'd rather wait in a tent for three days then hurt his pride.

The corner of her mouth turned upwards in a smile. That had been what, seven years ago? She had turned 24 just last month. Through all that time, she and Makoto had stuck faithfully together. And no one knew him better than she did.

And that's why she knew if he needed her for something, it must be important. Her smile quickly vanished as she contemplated on all the possible scenarios. Was he trapped somewhere? Maybe he was kidnapped? Or a bunch of thugs was torturing him in a basement!

She looked at the note with a newfound urgency. Don't worry, Makoto, she thought to herself as she pocketed the note and the key. I'll find you. I promise.

Pant…pant…pant…pant…

Sonoko leaned against the wall as she tried to get her breath back. She glanced at the sky. It was late, and the sun was setting. She'd been searching the whole day. She leaned her head back against the wall. Where in the world was he? She examined the key once again. It was made of wood, with a very complex pattern etched on it. What could this key be for? It was obviously not a conventional kind of key, which limited the kind of things it could unlock. Not a lot of doors could be unlocked by a wooden key.

Wait, a door?

She made a scramble for her pocket and pulled out the note once again.

I'll be waiting by our door

Our door

Our door.

Sonoko was swept off her feet in a whirl of memories. Her mind whisked her back to a place maybe two, three years ago…

"Makoto! Where are we going?"

"Well it won't be a surprise anymore if I tell you, right?"

"Hmph." Sonoko huffed angrily as she was lead blindly by her boyfriend. "Makoto, I'm serious! We've been walking around for hours!"

Makoto rolled his eyes at his girlfriend's exaggeration. "Sonoko, it's only been what, five minutes? Why are you complaining?"

"Time's different when you're blindfolded and you have no idea where you're going! I must look like a blundering idiot, following you with a blindfold on!"

"Relax." Makoto soothed, trying to calm his hysteric girlfriend down. "We're almost there. And besides, there's no one here to see you."

"Ow! I keep stubbing my toes on things! Makoto, seriously, where in the world are we-"

"We're here."

Sonoko waited in anticipation as he undid her blindfold and gasped.

"Oh…Makoto…"

In front of her was a huge door with elaborate designs carved all over. The mural's details were each defined and in the center of it all was the two of them, holding hands, backs turned and walking into the distance.

"It's…it's beautiful…"

He smiled. "I've been working on this for months. Happy Birthday, Sonoko." He said as he whisked her into his arms and kissed her. Sonoko felt dizzy with happiness. It was the best birthday present anyone could have given her.

"Makoto…" She whispered as they stopped for air "Why a door? Why not a wall or a canvas? Why did you choose a door?"

"Because," he whispered in her ear "this door is our door. I'm installing it in a house a block from here, and you'll keep the key. Just like you keep the key to my heart."

She smiled as they kissed once more.

Sonoko widened her eyes as she realized what the note meant. Our door. I can't believe what an idiot I was! She yelled at herself inwardly as she ran down the alley and out onto the street.

Sonoko looked up at the house. Makoto had shown her the house a couple of weeks after her birthday, having successfully installed their door in. She had almost forgotten about it. She narrowed her eyes in determination and pulled out the key. She inserted it into the lock, holding her breath, and…

Click

She wanted to yell and whoop with glee as she turned the lock. Makoto, don't worry. I'm here. I'm coming! She entered the house and looked around cautiously. "Makoto," she whispered. "Makoto!"

"Sonoko?"

She whipped around and saw him in a suit and tie, and looking rather dashing. But she didn't pay attention to any of that as she tackled his chest and hugged him with all her might.

"Oh my gosh! I received your note! Oh my gosh Makoto, are you okay? What's wrong? Are you hurt? Makoto?" she babbled as Makoto stared down at her with a confused look on his face.

"What do you mean 'hurt'? Of course I'm not hurt." He replied.

"B-but your note! Your key! And everything! You said you needed me, so obviously you were in trouble or something or…"

"Sonoko, I'm not in any trouble. What are you talking about?"

"But you wrote a note! You said you needed me!"

"Yes I did write a note. But I'm not hurt. I'm not in trouble."

"S-so what, is this a charade? Is-is this a silly game?" Sonoko's concern evaporated and turned into anger and irritation. She scowled. "What, you thought it would be fun to make me run around? Huh? Is that your idea of enjoyment? I was panicking. I was so worried about you! I thought you'd been hurt, or captured, or tortured! Did you think it would be fun to let me run around like a frightened rabbit? Well fine! Since there's nothing important for me here, then I'll just leave. Hope you had fun watching me run around!" She huffed and turned away from him.

"Sonoko."

"What! You've had your fun, just let me – Makoto?" He was on one knee, getting something from his pocket.

"M-makoto?"

"Sonoko, I wrote that I needed you, because I did. I've always needed you every second of my life. And I don't know what I'd do without you. I don't ever want to be without you, ever. I need you."

"Sonoko, will you marry me?"

a/n: Yipee! Two prompts down, 48 more to go! This one's a little shorter though. Well, this one's for RanMouri82 for making me feel so encouraged to write more! Thanks! You have no idea how you make me feel!

Please review so I know how to improve. I always want to be a better writer!