Chapter one: Leo's POV

Raph's been bullying Leo since they were ten years old. Leo's been self-conscious about himself ever since. He loves Raph and wants him to love him back. What happens to our leader once he breaks?

This is clarified in the book in a non-chapter, but to be clear: This is not T-cest.

Donnie and Leo are brothers, Raph and Mikey are brothers, and that's it. Donnie is not related Mikey or Raph, neither is Leo and vice versa. More details in "Just so you know".