Makoto x male child reader: The orca and his son.

At the young age of 5 (name) lost his parents to a car accident. The accident also led him to break both of his legs severely. He nearly lost the entire use of his legs. A year later to help him regain the proper use of his legs the orphanages caretakers signs (name) up for privet swimming lessons with a young swim instructor by the name of Makoto Tachibana. Makoto sees something special in this kid and soon a father and son like bond grows between them to the point where (name) calls Makoto dad. But when Makoto tries to adopt (name) the caretakers to see him as a not worthy parent as he's "too young" and "he's still in school". Will (name) and Makoto's friends help convince the caretakers he's worthy? Read to find out.