Ty realized that by staring at other men, Dustin seemed to be able to control his growth. He had no plans of letting Dustin get off that easily. Even though Dustin was already becoming freaklike in his bulges' proportion, Ty wanted to push the envelope. He made it so that when Dustin stared at another man, that other man would grow taller and more hung, with a bigger bulge.
As Dustin stared, the jock standing in the corner looking at board shorts, began to grow. It only took a fraction of a moment before the jock had to reach down and absentmindedly adjust himself. A minute more and the jock began to get paranoid and self conscience himself, and turned to the clothing rack, to readjust and discover his new endowment. He was also a few inches taller.
It was at this sudden movement of the jock and the return of the warm tingling that Dustin became aware of what was going on. He resumed his phallic growth. He just glared over at Ty. Ty just grinned back with an evil grin.
Only now, Ty was growing too while under Dustins's stare, and Dustin knew it.