You and Leo understand each other well for many reasons, but the main one was an ironic one.. both of you have younger brothers.

One day, you were REAAAAAAAAAAAALLY busy, you had tons of stuff to do, your parents weren't home and your little brother was bothering you, asking you to play with him and watch cartoons with him.

You were nearly growing gray hair because of the stress, so, in your despair, you brought your little brother to the sewers and asked the turtles to take care of him for you.

You went back home to finish all the stuff you had to do for the day, and after hours, you finally finished all the work.

You went back to the sewers to pick up your little brother. You looked everywhere and couldn't find him or the turtles... until you went inside the dojo and found Leo playing with your little brother.

Your little bro was holding a wooden sword between Leo's armpit while Leo played dead, your lil' bro seemed to have "killed" Leo.

"Oh no! The brave warrior has defeated me!" Leo exclaimed dramatically as he stuck his tongue out and closed his eyes, playing dead really dramatically as your little brother giggled. Clearly, neither of them noticed you.