My Brother's Best Friend...'s Brother (Boy Meets World fanfic)

My name is Katelyn Hunter. I have a twin brother named Shawn Hunter, and an older half-brother named Jack Hunter. Mine and Shawn's best friend is Cory Matthews. Cory has a brother, his name's Eric. He's also Jack's roommate. He's also the guy I've had a crush on ever since I first met him. Confusing? I know. Let me explain... *Sort of a season 5 AU*