I know that this wasn't requested, but i'm gonna do it. why? because i'm a sicko.

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"Big brother!"

Taro turned to see his little sister, hanako running toward him.

"Hi, hana-onee! How was your day!"

"It was great!" hanako exclaimed, giggling. The thirteen year old jumped up and down. "A reaaaally cute boy asked me out, and we're gonna have a date tommorow!"

Taro spluttered in shock. "Wh-wha..? But you're only 13!"

"Technically Legal!" hanako announced, and taro groaned, walking home as hanako merrily chatted.

"His name is Hikari Shōben! He's got blonde hair, and reeeaally cute blue-green eyes!-"

"Hanako" taro groaned. "I don't care"

Hana's lower lip wobbled. "Big brother?"

"Let's... go home. I'm tired" 'yeah, of hearing about your dumb boyfreind. wait... why do i even care?' taro thought.

(At home)

"Big brother, can we play a game?" hanako whined, and taro rolled his eyes. "Fine, fine. Which game?"

"The under-tales!" (dont comment about this reference. please)

"Ok, but if i win you have to clean my room"

Hanako glared. "Your room is a pigsty!" taro shrugged and hana smirked and crossed her arms.

"Well, if I win, you have to do whatever i say for the rest of today!"

Taro glanced at the clock. Huh. The rest of today was only 4 hours. (before hanakos bedtime)

"I can deal with that"

(After)

Taro dropped his controller in shock. Hanako smiled. "Yay!"

"B-but.." taro whined, before smiling. "Ok, you won fairly. What do you want me to do, oh great one?"

"Kiss me"

Taro's eyes widened. "What? H-HANAKO!!"

"What?" Hanako snorted. "You have no problems kissing other girls. Plus, i won. Come one, big brother!"

Taro swallowed thickly as hanako looked at his expectantly. He grabbed her hands and pushed her against the wall. She looked suprised.

"Big broth-?--"

He pushed his lips onto hers and she stopped protesting, kissing back sloppily.

He pulled away, a thin line of drool connecting their mouths.

"I love you, big brother"

Taro smiled and pulled the little girl to his chest"

'Me too"

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Sorry if this made you uncomfortable! I've always been a fan of forbidden love, and incest is just hammering that in. So yeah. Call me disgusting, i don't care. If you enjoyed, suggest more ideas for more pairings! Ps. i typed this on my phone not my tablet, so it might have some errors. Sorry!