You and Kyle are siblings, and you two are the same age. You both get along well.

You, Kyle, Stan, Kenny, Cartman and Butters were at the lockers. Kenny and Butters were being a little gay couple, Cartman was ranting like he always does, Stan was putting things away in his locker, and you and Kyle we're talking to each other.

"And then I just came up and kicked his ass!"

He was telling you about the recent time he beat up Cartman, along with Wendy.