Hiro: The Big brother (Big Hero 6 AU)

An alternate universe in which Hiro is the big brother and Tadashi is the little brother.

Synopsis:

Hiro had a hard enough life without a younger brother. He was a genius, but everyone had expectations for him. He was shunned for his intelligence. What would change if Hiro and Tadashi's ages were swapped. What would change? Hiro and Tadashi-centric.