You were part of Team Sonic, and while you were fighting Eggman with the rest of the team, he had hit you with a Ray he had made (he had not tested it out yet) and you turned into a 6 year old. After the fight was over, the gang had to decide what to do with you while Tails made a cure. Sonic had the most free time out of anyone, so everyone decided to let you stay with him for the meantime. So now you were sitting on Sonic's couch, while Sonic was looking for something to keep you occupied.