My Little Sister

Xiao Ya, call me Big Brother.

(Confused): Ah?

Call me Big Brother.

(Testing it out): Ah...

Big Brother.

(Serious): Ah.

Big Brother.

(Absolutely certain): Ah!

After that, whenever he called her "Big Brother," Xiao Ya would grin and toddle over with her arms outstretched.

Wait, which one of them is whose big brother?

-

Xiao Ya was raised bit by bit by a brother a few years older than her.

He wasn't much older himself. He taught her to talk and walk, showed her how to find things worth money at the planet's waste-processing plant, and dressed her up in a frilly skirt and made her look pretty on her birthdays. He even taught her how to freeload at rich people's houses. He taught her everything, though his lessons were a chaotic mess.

She grew up in that same chaotic way until she was fourteen, when her brother suddenly disappeared.

With her brother gone, Xiao Ya found herself a nice, well-off family and took good care of herself.

They met again years later.

He looked completely different: impeccably dressed, refined and aloof, and devastatingly handsome.

No matter what, he was still her brother.

Just like before, she leaped straight onto his back.

This time, she was going to hold on tight and never let go.

One-on-one romance, happy ending. Names and title are provisional.

Warnings:

1. Set in an alternate interstellar world.

2. They are not related as siblings. The leads have no blood or legal family ties whatsoever.

Theme: Love is the deepest bond of all.