A/N: I wanted to try a short-light hearted fic about possible shenanigans in Fairy Tail, and what better light-hearted leads than Natsu and Lucy? Hopefully this will last just like five chapters. It's just some random idea I got after re-watching Hana Kimi.

This takes place before the Tartarus arc. You know, before the story became darker and all that jazz. Warning! A bunch implied semi-canon ships and crackships ahead! I tagged this as Humor, but I don't expect it to be actually funny because I suck at humor, but it is light-hearted. Hopefully I can get at least a smile out of you guys.

This will also focus a lot on Natsu, Lucy, Gray and Erza's friendship and the awkwardness they have to deal with in the future? Something like that :D

Disclaimer: I don't own Fairy Tail.

Lie Detector

Chapter 1

"What am I supposed to do with this?!"

Lucy was sitting on her bed, staring at the strange-looking contraption that she had just unboxed. She sighed as the thought about how she had gotten this lacrima in the first place.

Earlier today, she was shopping for a new novel that she had been dying to buy since she heard from Levy that there was a limited time offer today in the nearest bookstore in Magnolia. She was lucky that she, Natsu, Happy, Gray and Erza had just gotten back from a job that paid a huge reward, and that day was their team's day off. It really was a lucky day.

That was, until the new novel she bought with the jewels she had just earned was ruined.

She was just exiting the bookstore when she saw an old lady struggling to cross a small bridge. It looked like the old lady was carrying quite a lot of stuff, so Lucy hurried over to her to help.

All was good until the old lady tripped.

Lucy in a desperate attempt to save her from falling into the river was able to pull the old lady to safety, but unfortunately wasn't able to save herself from splashing into river herself. The old lady had apologized and Lucy of course told her that it was nothing to worry about. She was glad that the nice old men that usually greeted her on boats weren't there to see her finally falling because that'd be really embarrassing.

She hadn't meant to complain about her now-currently-wet novel that was ruined when she splashed herself into the river out loud, but the old lady had heard it. Insisting that it was okay, that she could always just borrow a friends' book (referring to Levy), the old lady wanted to compensate for the damage of her new novel by giving her a box with a strange contraption inside.

"I don't have any jewels to give you. This is the only thing I have that might be of good use."

"Wait Obaasan! I really don't need this! It's my pleasure to help you!" Lucy insisted.

"You're not a very honest person, miss. This will help you in many ways." The old lady said mysteriously. "Maybe even in relationships."

Lucy's brow furrowed in confusion. "Relationships?"

"Don't worry, I promise you it's not dangerous."

"But-"Lucy hesitated.

"I won't take no for an answer." The old lady said sternly.

The blonde celestial wizard sighed. She looked at the strange box skeptically. "What is this?"

"A lie detector lacrima."

"Huh?" Lucy's jaw hung slightly open.

Why would an old lady carry around something like this anyway? Lucy had no idea. It really was a shame that her new novel got destroyed but apparently it was replaced by this so called lie detector. Honestly it looked like a helmet, with strange wires and a few bulbs. The old lady had mentioned her how to use it. Apparently it wasn't too difficult.

Lucy thought about this for a second. Was this even real? Maybe it wouldn't hurt to try. But she would need a person to try this out on. If this was in fact real, maybe she could sell it off for some jewels. Because no matter how many jobs Team Natsu did, after splitting it up she still couldn't save up for rent. Not with Natsu, Gray and even Erza wrecking up the town.

That's not a bad idea.

The blond was grinning ear-to-ear now. Sell it off for money? That was the best idea she had all day.

"There she goes again being weird and creepy."

"She hasn't learnt her lesson."

"AHHH!" Lucy shrieked at the voices she suddenly heard in her apartment.

She spun around and saw Natsu and Happy whispering to each other while doing push-ups in her room.

"HOW DID YOU GET IN HERE?" She shouted angrily.

"Window." Natsu shrugged, pausing his exercise.

Wait a minute. If Natsu was here, Lucy could try out this lacrima.

She immediately composed her expression. There was no use getting mad at him now. She supposed it was okay, it wasn't like she was in the middle of changing or anything.

She decided not to ask him how long had he been there.

"Lucy, you've been staring at that thingie a long time." Happy voiced out staring at the lacrima she had gotten.

She looked towards the lacrima and held it up to them. "This?"

"What is that?" Natsu asked.

Lucy became excited all of a sudden. "Hey Natsu, can you help me for a second?"

Natsu raised an eyebrow. "Only a second. There."

"You know what I mean!" Lucy motioned for him to sit on her bed. Well that was a first.

"Only now you're inviting me to your bed? How cruel."

Happy snickered.

"What the heck is that supposed to mean? Ugh just get over here!"

As soon as the pink-haired wizard sat down, Lucy slowly placed the lacrima-helmet on his head. Before Natsu could ask what the strange contraption was, Lucy answered his unasked question. "I got this lacrima from someone. It's a lie-detector lacrima. I wanted to test it out so it's perfect that you came by at the right time!"

Natsu and Happy looked at each other confusingly.

"Oookay."

"Here's how it works. I'm gonna say a statement and you have to answer with a no. If the helmet lights up, that means you're lying and the answer to my statement should have been a yes, got it?"

"Hmmm...this is boring."

"Aye." Happy agreed.

Lucy looked towards him irritatingly. "I take it you understand then."

What could she ask Natsu? She suddenly remembered the one thing that she had been wanted to ask but too embarrassed to. She was also afraid she would be angry if she knew the answer. But she didn't have any other ideas so might as well just roll with it.

"This whole week I've snuck into Lucy's bed at least once." Lucy stated while looking at the Dragon Slayer intently.

Natsu gulped. Oh, she had him now. "No?"

The lie-detector suddenly lit up bright and beeping sounds were heard in the room. Lucy could also see a small magic circle in the middle of the helmet.

"YOU LIAR!" She shouted. That obviously indicated he was lying right?

"I would have answered yes but you told me to say no!" Natsu defended, Happy echoing with an "Aye" in the background.

But no doubt the blue exceed was amused with all of this.

Before, Natsu and Happy only snuck in Lucy's bed when she wasn't around. But recently Natsu wanted to sneak in whenever he felt like it and of course Happy just went with him. Lucy's bed was soft and cozy after all. He had asked him "why" at one point, and Natsu only responded that the bed was warm. Happy looked at him weirdly then. He was a Fire Dragon Slayer. Why would he need Lucy's bed to be warm?

At first, Happy thought Natsu might have caught Lucy's "weird" disease. But then one night Happy woke up and saw the sight he won't ever forget.

Natsu was sleeping soundly as his arms were wrapped tightly around Lucy's back, and then the blue exceed understood.

He wondered why he hadn't teased Natsu for that.

But they always woke up first before Lucy did and escaped before she could catch them.

Lucy flushed. "Still!" She groaned. "I knew that I wasn't imagining it. It was just you guys."

"So you're not mad?"

"Of course I'm mad!"

Natsu frowned with a pout. He actually pouted! She didn't see that every day. Wait, from his reaction, which meant this lie detector thing actually worked?

"Natsu! This lacrima is the real deal!" She said ecstatic.

Natsu frowned. "Okay, now it's my turn to ask you something then."

"Y-You can't!" Lucy exclaimed surprised.

"Oh? That means you have something to hide then?"

"No! I just...I have a good idea on how to use this."

"You mean for pranking?!" Natsu said excited, his eyes shining.

Lucy rolled her eyes. "No, I'm going to sell this lacrima!"

"Why, Lucy?" Happy asked.

"What else? To make money of course! I can't survive on our jobs alone. I feel like I only get just enough. I need some extra money."

"For what?"

"Food, bills, grocery...there's a long list. And maybe some new clothes too. I feel like I'm wearing the same clothes every day." Lucy counted off the things she'd want to spend the money on.

"What's wrong with wearing the same thing every day?" Natsu asked looking down at his own clothes.

"Why would you even ask that?" Lucy forgot he almost wore the same thing everyday. "I like shopping that's all. It feels nice to have new things. And I like to think I have a sense of style and variety. It brings out my sex appeal." Why was she even explaining the reason why people bought new clothes to Natsu again?

Natsu would never understand Lucy's obsession with style and fashion. "You look perfect in anything you wear anyway."

Heat crept up on Lucy's pale cheeks. "T-That's not the point. Anyways -" She wanted to change the subject. Whenever Natsu threw out some random compliment she would always get flustered and antsy. He was an honest person, not really the type to lie. That only made her even more flustered.

Ugh...stupid butterflies.

"We should use it on the guild, Lucy!" Happy suggested.

Natsu laughed. "Nice idea, Happy!" He high-fived his blue exceed friend.

"Why would we do that?"

"Cmon Lucy. You can't tell me you don't have anything you want to ask the guild?"

"Yeah! And we can dig up some secrets! OHHH let's go now! I have something I wanna ask the underwear bastard!" Natsu took off the lacrima and was ready to take off before Lucy grabbed his arm.

"Wait! Wait! You can't do that!"

"Why?" Natsu looked genuinely confused.

"Why, you say. It's not right to dig someone's secret like that."

"It's not a secret though."

"But you just said- "

"- Lucy, we should try this lacrima some more. You wanna make sure it works properly before you sell it off right?" Happy asked.

"Ah." That makes sense, Lucy thought. "You have a point." And when Lucy thought about it, there were some things she wanted to ask to the other guild members.

Lucy was so sure she always locked her doors and windows every time she left her apartment, but Natsu always managed to find his way in. Her locks weren't even broken or anything. She had a sneaking suspicion. It wasn't just Natsu as well. Sometimes Gray and Erza found their way in her room.

Sure, she was used to it, and she liked it when her close friends hung out together sometimes, even if they were using her room as a meeting place. But still, that didn't stop the shock that came every time they appeared.

"Okay let's go to the guild then."Natsu and Happy grinned.

Lucy hoped that this wasn't one of their evil prank schemes. Honestly she didn't want to get caught up in anymore of their shenanigans.

"But only I'm allowed to try it out. Who knows what you guys are up to."

"Aww come on Lucy. I just wanna get back at the stripper." Natsu whined.

"AHA!" Lucy pointed accusingly at him. "You really are up to no good!" Natsu rolled his eyes.

"No one's gonna get hurt or anything," Natsu said. "Maybe." He added as an afterthought.

Lucy groaned. "Fine. You have to tell me first and only if I allow it then you can ask him."

"Eh...that's boring."

"Deal with it."

What she didn't know was that Natsu and Happy weren't going to be the cause of the shenanigans that would happen in their guild that day.

A/N: Hopefully you guys understand how the lie-detector works. I was inspired by Episode 3 of Hana Kimi when the guys used a lie-detector to find the underwear thief xD Ahh...good times.

Please review :3