Teaching Brady Basic Math

so this was a cute idea for a story plot, if anyone wants to pick it up as a RP just let me know.

so My character, Brady, has had his memory wiped, again and now he can't remember anything.

he is stuck as the Juggernaut saurian and can't speak, read, write, or do anything like that.
he can only remember the basic instinct, eat.

but he is kind and gentle at nature, so it works.

so the story is Brady is stuck in a city, a BIG one.
there is this little girl that lives with a rich family and was out in the city one day.

the streets were barron and no one around.
then from around a corner, some thug tries to kidnap her.

she screams for help, and brady hears the cry.

he also happened to be down the ally next to them at the time.
so he jumps out and scares the thug off.

the little girl looks at him, and he looks back.
they stand there for a second.

and she decides to take him home with her.

so she keeps him hidden in her room, her parents don't know anything about it.

in this time she teaches him how to read, write, spell, do math, and speak.

so this goes on for another 12 years.

Brady has remained unchanged but the girl is now in highschool.

so from there I am not sure where to go.
but I will draw pictures relating to the idea for a while.

(and your people's requests will soon be finished)