It was very satisfying to share a body with multiple versions of himself, and Ty and the other Tys were really enjoying it. To move around easier, Ty then used his powers to change their form. They became a row of conjoined Tys, with twelve heads, two arms, and thirteen legs. Ty also made it so that they were all perfectly coordinated with so few arms and so many legs, and altered all of his clothes to match their new form.
The Tys got dressed in a red shirt with twelve head holes, jeans with thirteen legs, and boxers with thirteen legs. They then shuffled out of their bedroom, curving their wide and flexible torso so they could move out the door, down the hall, and down the stairs. When they reached the bottom, they filed their way into the living room. The couch wasn't exactly wide enough, so Ty used his power to rearrange the furniture and stretch out the couch to make it roughly six times as long as it was, making it fill the whole room end to end. When the twelve body bros sat down, there was much more than enough room for them and another group of twelve.
Just then, a car pulled up into the driveway; June and Mark were still gone, but Dustin had been at a party last night. Now that he was home, Ty was looking forward to having a little fun with him, but decided to make it a bit of a surprise in a way. He secretly used his powers to temporarily affect Dustin's senses and memories, so that he would not see or hear the eleven other Tys and so that he would think his parent's couch had always been that wide. When Dustin walked in didn't see anything unusual--nothing unusual at all.
"Hey, Ty," said Dustin as he greeted his foster brother.
"Hey, bro," Ty answered. "Wanna have a seat?"
"Sure," Dustin replied. "That was one heck of a party last night."
Dustin plopped himself down on the far end of the couch--far from the Tys that he could not perceive. The other Tys smiled at Ty and signaled him to get started. Ty agreed and waited a few seconds until Dustin fell asleep. As Dustin began to snore, Ty secretly used his powers to make another wish.
Dustin suddenly woke up to a strange sensation in the right half of his body. He looked at it, and noticed it was growing wider. He also realized that his parent's couch was much wider than he remembered, about six times longer. Then he noticed Ty--and Ty's wide body, and his eleven extra heads. Ty had undone his alterations to Dustin's mind, but he was also doing something else.
Dustin noticed that the right half of his torso was still growing wider, taking his right arm away from him. Lumps began growing out of the top and bottom of the widening torso: the ones on his shoulders morphed into heads, and the ones at his hips grew into legs. When the growing stopped, Dustin was now as wide as the Tys, with thirteen legs and twelve heads. Needless to say, the Dustins were all a little freaked out by this.
"What the--?!" asked the original Dustin.
"How did--?!" exclaimed another.
"Who--?!"
"Why did--?!"
"Did you--?"
"What is this?"
"And how are you--?!"
"Why is the couch so long?"
"Can you--?!"
"Why did you--?!"
"Are we all me, or--?!"
"How do we use the bathroom?"
"Calm down, Dustins," said Ty. "This might take a little getting-used-to."