I'm Not Giving Up On You(A Big Hero 6 Fanfic)

(This is not a HiroxReader as most of the BH6 fanfics are, but you're free to use your imagination and think it's you ;D)

There's so much more to a 13 year old girl that is found on the Hamada's garbage dump. Waking up obnoxious about the world around her(to the point of forgetting everything), Cass Hamada's caring nature puts a HUGE RESPONSIBILITY for the 14 year old Hiro Hamada to that leads him to follow his brother's footsteps. That pushes the young genius to become the Tadashi figure in the girl's life and use the same line, "I'm not giving up on you." when almost everything in their world seems so crazy. So, can he finally say "I'm now like my brother." ,or will he not, for the sake of something more?