The pleasure had become too much. The still human but now monstrous Dustin couldn't think straight, and he just grabbed the vial and downed the whole thing in one gulp.
"Oh no," he said in his low voice. "I hope that wasn't a mistAAAKKKE." His voice turned into a bestial growl before he could finish, and the changes began.
His entire body began to shake as the potion went through his system, changing him from within.
Dustin roared and he hulked out of his clothes. His arms and hands swelled into grotesque proportions, and destroyed the tough fabric of the jersey. He leaned over, growling and slobbering as his mammoth back made short work of the rest of the jersey. Hair had covered every inch of his skin, and it kept growing into a shaggy mat of fur that almost couldn't keep up with the enormous amount of mass that Dustin's body was gaining. His hands grew larger than baseball mits and his claws became longer and sharper. He slammed his fist down and cracked the floor.
He felt his face begin to change. His nose began to gain canine aspects and his brow became a cliff. Horns grew from his forehead and twisted. He felt his jaw change and grow to allow for a set of bigger and stronger teeth. His canines, especially the lower ones, grew much longer, and they jutted out of his thick lips. Every inch of his face became covered with hair.
His legs had grown to support his upper body weight, which was a lot. His feet were much larger now, and also ended in sharp black claws.
Though the changes on his face and body had stopped, his growth hadn't. Dustin the beastman began to pump himself up higher, becoming a giant monster. When he reached the ceiling, the pain and uncontrollable rage made him roar. The mirror shattered at the sound.
Dustin looked at himself when the changes subsided. He had become a giant monster. Every muscle in his body was pumped like it would explode. He was at least ten feet tall, and had to weigh more than 1000 lbs.
He was indestrictible and powerful. He wanted to show the world what kind of power he wielded with his new body.