A/N: Principessa Ramen here! This fic includes 2 OCs, haruki Shirone and Kyo Kurone. This is a song fic for the song Juvenile by Rin and Len. Yes, I am a RinLen fan, but to an extent. This is a three-shot fic! Part One (This Chapter) is Len's part, Part Two, is Rin's , and Part Three is the confrontation! Hope you likey!

And I've just found, I'm addicted to you~

A black-haired, red-eyed boy boy blushed as he took the hand of his girlfriend standing next to him. The silver-haired, dark-skinned girl looked over to him smiling.

I love the way you feel, turns me on more~

A blonde boy wrapped his arm around his equally blonde girlfriend. She nuzzled into his shoulder as he kissed her forehead.

HOW COULD WE BE SO JUVENILE?

"Kyo! Y'know Rin Kagamine?" Len kagamine slammed on his best friend's desk. Kyo Kurone's red eyes looked up from his texbook. He nodded at the letterman-jaket-wearing underclassman before him, "She's the cutest girl in my class," He pulled up a chair and sat behind Kyo. "should I ask her for her e-mail, Kyo?"

Kyo shrugged his shoulders. "Maybe…" His eyes deffered back to the textbook on his desk. Len began to ramble arrogantly again.

"I'm a cool guy right? Heh, there's no need for me to be shy! I'll do it!

The pride off len's willingness to make a move on a girl made the raven haired sempai feel quite in superior. Had his bangs not hid his face, you could see his fasce slightly flushed. "Um, well from my POV," Kyo started calmly, face still unseen. "You can't exactly tell if that'll lead to lead to love…let alone that it will be love. B-but I find this kinda situation quite awkward, so…" The blonde firdt-year looked at his sempai. Kyo has never felt awkward about his romantic endeavors until…

Len snapped his fingers in enlightenment. " How can you not tell? Aren't you going out with a third year? Shirone, right?" Kyo face planted into histexbook at the mention of her name.

Haruki Shirone is her name. She was tall, five-foot-eight, and was a milk-chocolate color, so she definitely stood out. She was 17 years old, a third-year, and the only student at Cryton High to advance a grade with good test scores alone. Oh, the chick swears she's a princes, and always argues with Miku Hatsune on the subject. Along with weilding a 20-ton hammer, being, ;lazy, and a pervert, how she found quiet, nerdy Kurone fascinating was beyond comprhension for him and everyone else. To make matters worse, she asked him out.

"Um, let's not talk about her…" Kyo mumbled into his textbook.

"Geez, Kyo! It's been two months since you two been together. Why aren't you guys walking arm and arm publicly?"

"Why do you care?" Kyo lifted up his head and glared at the blonde.

"E-etto…hey, both of them have PE this period, we can see them walking there from the window!" Len ran over to the window, Kyo walking behind him. The two scanned the area for thei significant other. Kyo spotted his first.

"Hey, hey! Wait, who is she looking at there?" He saw as she looked toward the heartthrob of her class, Gakupo Kamui, known to be so suave and seductive, which is more his girlfriend's type. Next to her, she was arm in arm with Rin Kagamine.

"Why is he giving that pervert the flirty stare?" Len saw Rin dirested toward the blue-haired boy next to Gakupo, Kaito Shion, also in Shirone's class. The cutesy idiotic type has always been Rin's prefference.

Both girls turned away and walked to the gym, both boys watching them disappear into the building. They didn't say it, but both thought the same thing:

'I don't get her! She's like a fickle cat, cute with an easy changed heart~'

CIAOSSU~!