"For every second that Ian thinks of sex or masturbation," Ty thought," his dick will grow 10% longer, he will get 10% heavier and more muscled, and he will grow 10% taller."
Of course, Ian was in the very depths of puberty right now, practically drowning in hormones. He very rarely thought of anything but sex.
"Oh Shit! Mark and June!" Ty thought. "I better go check on them!"
"I'll be right back," he said, as he ran out of the room.
Ian didn't have time to give any reply other than a grunt. He sat on the couch for a minute, and he began to think of...