Imagine the tune for "Do You Like Waffles?" by Guttermouth when you read the lyrics. This was originally going to be a LenKa fic (when I imagined it) but the idea really is just a little drabble bunny after all and I'm not the best romance writer. Plus the song is so silly I have no idea how I'd make that transition. Also I got into Vocaloids literally 4 days ago so it may or may not be OOC. I apologize!

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"Niisan!" Len yelled as he and Rin ran into the room where Kaito was reading an ice cream recipe book.
"What is it, you two?" Kaito asked with a smile.
"We wrote a song for you, Niisan! Here!" Len said, taking the music sheet from Rin and handing it happily to the bluenette. Kaito looked over the sheet, eyes widening, his face turning a little pink. The song on the sheet went:

Do you like chocolate? (Yeah, we like chocolate!)
Do you like vanilla? (Yeah, we like vanilla!)
Do you like strawberry? (Yeah, we like strawberry!)
Doo doo doodoo, can't wait to get another! Ice cream! Ice cream! Ice cream! Ice! Doo doo doodoo, can't wait to get another one!
Do you like chocolate? (Yeah, we like chocolate!)
Do you like vanilla? (Yeah, we like vanilla!)
Do you like strawberry? (Yeah, we like strawberry!)
Doo doo doodoo, can't wait to get another one!

(Or, in Japanese)

Choco ga suki ka? (Choco ga suki yo!)
Banira ga suki ka? (Banira ga suki yo!)
Ichigo ga suki ka? (Ichigo ga suki yo!)
Zuzuzuzu, matsu ga dekinai! Aisu kuriimu! Aisu kuriimu! Aisu kuriimu! Aisu! Zu zu zuzu, matsu ga dekinai!
Choco ga suki ka? (Choco ga suki yo!)
Banira ga suki ka? (Banira ga suki yo!)
Ichigo ga suki ka? (Ichigo ga suki yo!) Zu zu zuzu, matsu ga dekinai!

Kaito looked up from the paper with tears in his eyes. Len and Rin looked at him with a sad, confused face. "What's wrong, Kaito-niisan?"

"It's... it's so beautiful... thank you so much!" Kaito cried out, grabbing the twins in a big bear hug.

"Hahaha! No problem, Kaito-niisan!" Len managed to say through laughter.

Rin narrowed her eyes and smiled. "Len was SOOO excited about doing this for you. He said "I'm going to give Kaito-niisan the best song ever!" He was super excited about making you like him even more." Len went crimson and shot Rin a look that said both "I might kill you later" and "do you have to make it THAT obvious?"

...Unfortunately for Len and all the huge LenKa fangirls out there, Kaito was too busy reading over the song again to notice.

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This was made purely for the purpose of drabble. Drabbles are fun. Plus when I get my hands on a copy of Vocaloid (preferably Kaito or Len) this is the first thing I plan to do. (Seriously.) I wrote this on my Tinier-Me account.