Author's note: First Vocaloid fanfic! It's yaoi, of course. It's much more fun to write yaoi. It's Kaito x Len lemon, so you are warned (but seriously, if you don't like yaoi, and you clicked on this despite the notices on the story description, why did you?) Onii-san, by the way, is a Japanese term of endearment for an older brother or an older brother-type figure.

ooooooo

"Onii-chan… Could you help me with this?"

It was early in the morning. A boy with blonde hair stood facing a mirror, an undone tie around his neck.

"What do you need help with, Len?" Said a blue haired older man across the room.

He wore a white coat and a scarf wrapped around his neck. A smile was etched across his face as he tied the laces of his shoes.

"I can't get my tie right," Len said with a slight pout.

Kaito chuckled and walked across the room to him. He took both ends of the piece of fabric in his hands.

"You've been doing this for years… figured you would be able to do this by now," the older male teased.

Len blushed but pretended to ignore him. He loved the feel of the blue haired man's hands all across him as Kaito tied his tie.

Slowly over the past few years Len had started feeling something for the older male. The way he smiled made the blonde's heart melt, especially when that smile was directed at him. The sight of Kaito without his shirt… it made his body do things it did for no one else. Eventually, he came to accept this as love.

Kaito finished up and backed away. Len felt a surge of disappointment as the hands stopped their touching of him. The blonde sighed and walked out of the room. Kaito didn't even look his way as the blue haired boy continued tying up his shoelaces. Len walked out into the dining room and sat down at the table. He rested one cheek on his hand and stared off to nowhere. His mind slowly started supplying images of Kaito.

The blue haired man drew the blonde towards him, their lips getting closer and closer till they touched. A hand traced its way across Len's hip. The hand reached into the young boy's shorts. A pleasant shiver traveled up the blonde's spine as the hand touched his bare skin. A voice called his name.

"Len…"

He ignored the voice. Kaito's tongue made its way into his mouth, and he was in paradise. The blue haired man's hand traveled through the blonde boy's pants, until it came to the lump in the boy's underwear. Len gave a little "oomph" of surprise as the hand grabbed it. His mind went blank as Kaito stroked the lump. He gave a little, throaty moan of joy.

"Len!"

Len gave a jolt as he was knocked out of his day dream. Rin stood in front of him, a look of shock on her face. Her blue eyes were staring down at his lap. He followed her gaze and blushed when he saw what his twin sister was looking at. His pants were pushed down, along with his underwear. A hand grabbed at his member, which was leaking pre-cum. He quickly let go and pulled his pants up. Rin stared at him, and then broke into a smirk.

"Daydreaming about Kaito again?" She asked.

Len averted his eye. He nodded sheepishly. Rin put a hand over her mouth, and then started cracking up with laughter. The blonde haired girl managed to pull herself together after nearly a minute of this. Len eyed her angrily then turned away.

"Sorry Len," she said.

Awhile back Rin had caught him doing this same thing. Rather that make phony excuses, he told her there and then he liked Kaito. At first she was in shock; not every day one's twin brother came out like that to them. But she warmed up quickly to it. Soon she was discussing boys and dates with them with him. He offered his input, but never fully agreed; there was only one guy for him.

Len sighed.

"It's OK Rin."

His blonde haired sister pulled out a seat and sat next to him.

"At least it was me who found you, and not someone else."

"Still… it's embarrassing either way."

Rin laid a hand on his shoulder and smiled reassuringly. Len finally smiled slightly back. He couldn't stay upset with his twin. Not after she'd kept this secret of his for a while now.

"So what was your daydream about?" The blonde haired girl asked.

"The normal…" Len answered.

Rin just gave him a puzzled look. Len sighed and dropped his voice to a whisper.

"Kaito jerking me off, OK?"

His sister's mouth dropped, forming a perfect little O. Len looked away sheepishly, embarrassed he told her. What she did next was unexpected; she started grinning.

"OMG that's soooooo cute~" She said dreamily.

Len just stared in shock. A guy jerking off to the thought of another was cute!? He continued staring as Rin continued freaking out. The blonde haired boy started blushing strangely and he turned away to wait for her to calm down.

"Sorry," she said when she calmed down. "I'm a yaoi fan."

Len looked at her and raised an eyebrow.

"A… yaoi fan?" He asked hesitantly. "I dunno what that is."

Rin giggled.

"Let me show you~"

She dragged him to her room. Rin dug through her closet and pulled up a box filled with what looked like comics. The blonde haired girl pulled one out, flipped through the pages, and then handed it to Len. The blonde haired boy read the cover and noticed the R 17+ on the cover. Rin motioned for him to go on, and he opened up to a random page in the middle.

He instantly got a hard on at the sight of the inside. Two guys were close to each other, naked and sweaty. One had his face buried in the other's crouch. A drawn x-ray showed the other guy's penis was in his mouth, and it was being sucked and licked eagerly. Len's face turned redder and redder as he flipped through the pages. One scene was of the sucking guy's penis being in the butt of the other. Len's erection ached painfully, and he gave a little moan of want. All of it looked like it felt amazing, and his imagination was supplying images of Kaito doing that to him. He fought back the urge to jack himself off, and closed the book.

"Can I borrow this?" He asked his sister.

"Sure," Rin answered, holding in a giggle.

Len left the room reading the comic. He couldn't turn away. As he read, his hormonal mind started coming up with an idea. He would do this with Kaito. Tonight.

A few hours later the Vocaloids settled down to dinner. Len took his normal seat next to Kaito, one he claimed a while ago to get as close to the older man as he could. He desperately wanted to start it now, but Luka was to close for him to do anything. It would have to wait.

Across the table, Meiko cracked open one of her many jugs of sake. She started pouring out cups for the older Vocaloids. Gakupo drank greedily from his and set it back down on the table. Luka said no to hers, and the cup went to Kaito. Kaito took a drink, and then put it down. His cheeks had already started to flush red from the alcohol. Len grinned slightly. A slight edit to his plan was needed.

Gakupo asked for the bottle and poured himself another glass. He offered it to Kaito, who took it and poured himself a little. The blue haired man placed the bottle down on the table, right within arm's length of Len. Another stroke of luck for the blonde boy. Len looked around sneakily, and poured Kaito some more. Kaito took a drink, unaware of the younger boy's scheming.

As the night went on, Len made sure Kaito's glass was never empty. Kaito's face grew more and more red and the man grew even drunker. His voice slurred. Len grew giddy at his success. After not too much longer Kaito excused himself to his room. He got up, and almost fell down.

"Here onii-chan, let me help," Len said eagerly.

"Thank you Len," Kaito slurred.

Len helped Kaito to his room and opened the door. The older male stumbled in and sat on the bed before he fell down. Len followed him in, and shut the door behind him.

He sat down next to Kaito.

"You OK?" He asked. "You look sick."

"I'm just a little *hic* drunk." Kaito answered.

Len snaked his hand around and placed it on Kaito's lap.

"It's OK, onii-chan," the blonde said. "I'll make it feel better."

With one fluid motion the blonde boy pushed the older male back onto the bed. Kaito was too drunk or surprised to object, and landed backwards with an "oomph." Len energetically tugged the older man's pants and blue boxers, revealing the older man's flaccid member.

So how do I do this…, Len thought to himself. I just take it in my mouth and…

Len took a hesitant lick at Kaito's penis. It tasted of sweat, and wasn't very good-tasting, but not that bad. He continued licking until he felt it start to harden. Kaito protested drunkenly, but the blonde boy ignored him and took it into his mouth.

This feels so weird…, Len mused.

He started sloppily sucking and licking. Kaito gave a moan as his body enjoyed what the younger boy was doing. Len started wondering what this really was doing, but then something started leaking out of it. The blonde had no idea what it was at first, but he soon realized he liked the taste of it. He sucked eagerly, lapping at the liquid that started increasing in amount the longer he went. Suddenly he remembered what it was.

So this is what pre-cum tastes like, huh?

Kaito's face was turning redder and redder as Len continued. The blue-haired boy squirmed from his attention. Len was hooked on the pre-cum, and licked it up greedily. Suddenly Kaito grabbed his head and forced it downward. The older male's erection was forced up Len's throat, causing the blonde to gag. His tongue was held down by the manhood in his mouth, so he stopped licking and continued sucking.

Kaito suddenly gave a cry and warm liquid shot down Len's throat. Some spilled out onto his face and the into the blue haired man's lap. He gagged at first, but quickly developed a liking for it. Len greedily lapped it off Kaito and wiped it off his face. He swallowed every little bit of it as he could. After that was done, the blonde turned back to the older male. The blue haired man's erection stood still fully erect. Len gave a grin.

"Looks like onii-chan needs some more attention~" Len said in a sing-song voice.

Len straddled Kaito's hips and positioned himself above the older male's penis. He tugged his pants down and grabbed ahold of older male's manhood. Len moved it around, trying to find his entrance. He felt the wet member prod slightly inside him, and smirked. Throwing caution to the wind he pushed it inside himself.

He cried out as his virgin entrance was forcibly entered. Tears gathered in his eyes but he continued. He would do this with Kaito, the only man he ever liked. He slid down so that Kaito's manhood was entirely in him. Kaito was making weird sounds all the while, and his face was beet red. Len's mind was blank with pain and something else; a weird pleasure. Kaito was in him. He could believe it. Len squeezed the erection deep within him, making Kaito cry out. Feel the younger male squeeze him down there, made something snap within him.

Kaito pushed Len forward onto his back, keeping his erection with in the blonde. Len gave an oomph of surprise. The older male leaned over the younger. He pulled out almost all the way, and then slammed back into Len. Len gave a cry of pain and pleasure. His mind was overwhelmed, except for one fact; Kaito was in him. Kaito kept repeating the movement, thrusting into Len energetically. Len cried out with each thrust, begging for Kaito to go faster. He started babbling, his mind on overload.

"I love you onii-chan!" He cried out suddenly.

Kaito slowed down his thrusts in surprise.

"Wha… what?" He asked in confusion.

"I love you, Kaito. I have for a while now…," Len repeated.

Suddenly, Kaito's erection gave a twitch within Len. Suddenly the blue haired man came within Len, sending cum deep within the younger male. Len felt something warm and wet go in him. The blonde moaned, and came himself. Cum shot out of his erection and landed on his chest. Both males were tired and sweaty. Slowly Kaito pulled out of Len, and collapsed onto the bed. He pulled Len closer to him, and then brought the young boy's lips to his. Len gave a little gasp of surprise, but he melted into the kiss.

"I love you to, Len."