"Not bad," Dustin said. "Having a few clones is a bit cooler than just having four arms. I admit defeat."
With that, the boys used their powers to undo their changes. Dustin's extra arms vanished as his body and clothes went back to their original state, and the four Tys jumped together and merged back into one body--however, there were two heads on the wide body.
"What? What are you doing now?" Dustin asked.
"I came up with an interesting new idea," said the Ty on their left-hand side.
"What is it?" Dustin asked.
"First, I'm going to name my other head 'Ky' so as to avoid confusion," said the same head.
"Second, we came up with an idea for us to enjoy for a while," Ky added.
"From now on," Ty said, "anyone who we get to say any one of our names will get another head."
"And they will simply believe that anyone who has extra heads, even if they just got some, has always been like that," Ky added, "and no one but us and any of our other heads will be aware of the change."
"Our heads?" Dustin asked. "Do you mean that same thing could happen to us, Ty?"
What happened next answered Dustin's question. First, Dustin felt a strange sensation in his head, as if something was pulling on both sides of it. Dustin looked into Ty's mirror and saw what was happening. Dustin's head began to replicate, the two growing further apart something like a mirror effect on a computer or something. Dustin's body growing wider with them as well. Dustin's nose split into two noses painlessly, and then a third eye began to form between them. Dustin's widened mouth then split into two, followed by his neck. As Dustin's new eye split in two as well, Dustin's new middle cheek began to divide. As Dustin's scalp and cheek split, Dustin now had two identical heads, each of which had the same memories and knew of everything that had happened today. Dustin's heads moved further apart as their shared body grew wider, their clothes modifying themselves fit their new body's standards. When the changes finished, there were two two-headed bodies in the room. The left-hand heads were the originals (Ty and Dustin) while the right-hand ones were the newbies (Ky and Justin). All four were fully coordinated sharing a body with someone else.
Then the four remembered the wish that Ty and Ky had made...