A/N: Yay! Pesky little brothers out of the house so I thought I'd use my free time (finally!) to write this fic. I stumble upon this little plot bunny during breakfast but I'm writing it just now.

By Mouth

Tsuna-san, Haru is in big pinch right now. I hope you can forgive her.

Haru prayed silently as she proceeded to pin the guy into the wall behind him. She dropped her schoolbag to her feet, flinging it carelessly over her shoulder. And then leaned closer like she had seen so many students do with their boyfriends when she passed them by when going home from her review school at night.

She had no idea what the guy was thinking. She couldn't see his eyes considering that they were hidden by his bangs, but he seemed too out of it to complain, or to care. Haru's just fine with that.

How had she gotten into this situation in the first place?

She had been going home from her review school that night. It was past 9pm, but she's not really worried. She's used to going home late at night on Thursdays. Plus she lived in a good neighborhood.

She hummed softly as she walked, thinking about seeing Tsuna-san earlier this morning. Was it just her imagination? The brunette seem to be warming up to her. She had even manage to make him agree on a date with her this Saturday.

Nothing could ruin her mood tonight...or so she thought.

She stopped short when she saw a shadow walking slowly towards her. He was leaning heavily on the wall, dragging his feet to move. Was it a drunk ojii-san? She readied herself, holding her bag in front of her, ready to hit him if he so much as make a leering pass on her.

But it wasn't a drunk ojii-san. It was a teenage boy about her age. As he came into the light of the street lamp, she could see that he was blond and covered with blood.

Also, he was wearing a tiara.

Belphegor leaned on the wall, willing himself to take another step. They dare doublecross him? Oh, someone was going to pay. They had shed royal blood, and not just a drop at that. He will make them pay. He just needs to sleep off and then when he got his energy back, he'll hunt them in the morning. All of them.

It was a simple enough mission. All he had to do was to assassinate a former mafia guy who belongs to some Family that had pissed Xanxus off in the past. He figured he'd kill him, get some sushi and then be on his plane back to Italy in the morning. He hadn't counted on the guy calling some of his old connections and ambushing him. Worse, they'd manage to poison him and even though it was just a needle scratch, it still made his sight dim and cause him to lose his balance.

He needed a place to stay for the night. He'd sleep the poison off. Most of the exhaustion was from the jet lag anyway. A hotel would be no good since they'd easily find him. He was alone in Japan and damn if he was going to ask for help from the Vongola 10th and his Family. Not that they'd help him anyway. So he would have to sneak into someone's house.

He spotted a girl up ahead, frozen into the sidewalk staring at him. He forgot how civilians were so shocked with seeing blood. It had become a daily thing for him that it didn't bother him anymore. Her eyes followed him as he walked closer. Curiously, she didn't run away. Maybe fear had frozen her?

Both their attentions were caught by voices shouting as each other. They were looking for him. He didn't blame them. If he made it out alive tonight, they''d be dead this time tomorrow. He was about to turn to the girl to warn her. Run away if you want to live. The unexpected concern took him by surprise but told himself that he didn't particularly care, just that it would be more blood on his hands.

With surprising speed, the girl turned to him instead, and then pinned him on the wall behind him. She put one arm behind his neck, the other on his shoulder to support herself. She placed one of his hand on her hip. Before proceeding to...uhh..climb all over him. He allowed himself a small smile.

This evening was just full of surprises.

Upon closer inspection, one could see that the two teenagers entwined into each other were not really doing anything. They were just standing there, with their hands all over each other. They weren't kissing, although the angle the girl's head was at, covering the boy's face was deceptively placed. And the tension between them was so thick, it was almost tangible.

But the guys that passed by didn't inspect them closely. They just threw them a glance, saw a couple of teens with raging hormones and dismissed them as fairly harmless. They could asked them for directions, but they doubted they saw anything with their faces buried to each other like that. When your girlfriend's face is in front of you, it was hard to see anything else, even a bloodied teenage assassin running for cover.

Youth sure is nice.

Haru released a sigh of relief and removed herself from him, smoothing her skirt modestly. She avoided meeting his eyes (not that she could see them, but she could feel them following her) and picked up her bag instead.

"I can't believe they fell for that," she said looking at the general direction the guys took off. "That's like the oldest trick in the book-desu"

She turned to him again. "Well, that went well," she said, trying to sound nonchalant like she's used to rescuing strangers every night. "I really have to get going now"

That was the plan.

"Wait," the guy said, catching her wrist before she could walk away. "Why'd you help me?" he asked, suspicious.

This is what she get? She really didn't know why exactly, she was just a good girl at heart, and didn't stand for the strong bullying the weak. It was as simple as that.

"You were clearly outgunned and outmanned," she explained to him. "And you're just a kid."

One blonde eyebrow rose that she couldn't see. This girl was interesting, calling him a kid when she was looks about his age. Was he insulting the prince? It didn't look like that, she was simply ignorant. Since she helped him, he'd let that pass for now.

When the guy just stood there, staring at her. Haru took it as a sign she could go.

"Okay, I'm going now," she said, walking away. "Be careful,"

Belphegor stared after her a few more minutes before he moved to follow her. He needed to stay some place tonight and hers was just as good as any. Besides, the girl intrigued him. She stopped in front of a big enough house, not unlike that Sawada brat's, and after a few more minutes a light turned on at the second floor and her silhouette could be seen through the window.

Belphegor had the modesty to look away when he saw her raised her hand above her head to remove her shirt. He waited a few more minutes after that, before cracking the window open. He was at the roof by the way.

The girl was in the bathroom when he entered and he placed himself comfortably enough on her bed. Perfect, not too hard or too soft. The kind of bed the prince liked.

"H-Hahi!"

He turned to the bathroom door to find the girl wearing an oversized shirt.

"W-What're you doing at Haru's room? How did you get in here?"

The soft breeze that blew inside the room answered her question.

"Ushishi...The Prince needs a place to stay the night," he told her loftily. "The prince decided to stay here," his voice sounded like she should be honored.

"B-But!"

Haru was slowly regretting her decision. It was all just an impulse actually. She felt sorry for the guy being hunted by those old men with guns. And if she was going to be a mafia boss's wife, she figured she'd have to start somewhere. And helping a stranger seemed like a good first step to her at the time.

Now, it just felt like a big mistake.

She sighed, and tried to calm herself down. Go for it Haru! You can kick this guy out!

She turned to him, intending to tell him off, but saw that the guy had already fallen asleep. He must've been so tired after running away from those guys. A little pity twinge at her heart. She nudged him carefully, and he looked at her bleary-eyed.

"Okay," she said. "You can stay here tonight, but you'll sleep on the floor."

He went to the floor quietly, too exhausted to complain.

Haru hugged her trusty hockey stick to her chest, taking it with her at the bed. "And if you try to lay a hand on Haru," she said, trying to sound brave. "Haru will kick your ass."

It was an empty threat. This guy was clearly dangerous, she could feel it. But strange too, she felt safe with him. She thought that since she helped him, maybe he wouldn't hurt her. Maybe.

Haru slept soundly that night.

"AHHH!"

Haru's scream waked the Miura household the next morning. Her mom and dad rushed to her door pounding.

"Haru? What's wrong?" her dad asked, worried.

"N-Nothing," she said, over their knocks. "I just saw a cockroach!" she lied.

She could hear them chuckle behind the closed door. Just another weird morning because of their daughter. She pretended to laugh along with them. "I'll be right down," she called out.

When she was sure they were gone, she let her head hit the pillow again. All those shouting has strained her neck. She laid down again, careful though to keep away from the blonde guy, whose face was an inched from her face. His arms were wrapped around her waist so she couldn't get up.

"Hey!" she called out to him. When he didn't budge, she called out a little louder. "Hey-desu!"

The blonde guy let out a smirk. There was no telling if he was awake, except if she sweep his bangs aside, she reached out only for her hand to be caught.

"The Prince heard you the first time," he said.

"What're you doing in Haru's bed!" she gritted her teeth at him.

"The floorboards are cold and it hurts the Prince's back," he said as he removed his arm in a maddeningly slow pace. "Besides, the Prince's likes this bed."

It was a good thing Haru was a morning person.

Ahh...it's Prince's this, Prince's that...what was up with this guy anyway? Of all the people to help last night, why'd she picked up such a weirdo?

"Get out!" she said. "Haru is going to get ready for school now,"

Obediently, he moved to the window. An insane smile on his lips.

"I need to take care of some things," he said as if he hadn't heard her. "I'll be back...princess."

After class...

He spotted her right away when she exited her school building. After all, she was the only one who moved that...gaily. Where the other girls walked, feet shuffling like penguins. She skipped happily, even running towards the gates. Right into him.

Her expression soured.

"What're you doing in Haru's school?" she hissed. No wonder there were more girls on the front gate. They were, as Hibari-san would put it, crowding around him.

"The Prince finished getting back to those guys yesterday," he said. "He came here to thank you."

"Thank me?" she asked.

Belphegor shrugged, it was an excuse as good as any. He just wanted to see her again. He was strangely drawn to her. He was a genius, but he couldn't understand why she helped him last night. Why she let him sleep in her room, why she intrigued him so much. She was just so...different, interesting.

Maybe even worthy of the prince.

"Tsuna-san~~"

This time, it was his expression that soured. For just a split of second, even though the maniacal grin was back in his face immediately.

"H-Haru!" the brunette looked from her to him. "Belphegor!"

"Yo!" he said. "Long time no see,"

"W-What're you doing here?" the Vongola Boss asked, although his eyes were more trained to their holding hands. Haru had pulled him earlier because she wanted to hurry up and see someone, which turned to be the young Boss. "And with Haru?"

Haru was quick to disentangle them.

"H-Haru just..uhh..there's a good explanation for this Tsuna-san," she wondered where to begin. At the rate this was going, was their date tomorrow still on?

"Ushishi...this princess rescued the prince yesterday," he said, one hand grabbing Haru's wrist again, while Tsuna held on to the other. "I just wanted to thank her, that's all."

A small snicker escaped Reborn who had been watching everything. Belphegor thanking someone? As if! Had the Varia somehow learned of his plan to influence Tsuna so he would pick Haru as his wife? She would be perfect. Brave, intelligent, dynamic, fiercely loyal to Tsuna. It also didn't hurt that she was a beauty.

Their date tomorrow was also part of his plan.

Haru was growing frustrated by the minute. She was happy, Tsuna-san seemed to be paying more attention to her now. And he was holding her hand. But Belphegor (she learned his name just now, she seriously thought her name was Prince) was ruining the experience. She tugged at her hand, and when he wouldn't let go, she removed her hand from Tsuna-san (even though she really didn't want to!) so she could face him.

"Haru is happy to help you. You don't have to do anything to thank me," she told him. "You can just thank Haru by mouth," she said, meaning he could just tell her 'Thank You'. Now that she mentions it, he just kept saying he wants to thank her but have never even said 'Thanks' to her.

Belpeghor smirked. Now, there's an interesting suggestion.

He pulled her hand and in one swift motion used his other arm to circle her waist. Haru's chestnut brown eyes widen as he leaned in his face closer and gave her her very first kiss.

It lasted for a few seconds, before Tsuna pulled Haru away. Lips still parted from the surprise.

"Ushishishi...thank you,"

A/N: What do you think? This plot bunny completely took me by surprise. Never thought of writing a BelxHaru before. Hope I did well. R&R please! ^^