Hey, good story, although there should've been some more of it. And I don't think Cartman would've waited until he was grown up, believe e he would've been capable of doing that whenever he wanted. Remember the Scott Tenormen episode? It was really creepy though, I think you're quite a good writer.
Kyle's my homie, but it seemed like someone would write something like this eventually. Guess I won't complain, since if there were another chapter Stan would totally pwn Cartman.