Jeff had chosen the duration to remain until the end of the day, and waited with some anticipation for the change to appear. After what felt like an hour, it popped up with a 'ping' sound.
"A Best Friend"
Jeff immediately felt a hot flush rushing through his body, making him bend over slightly and moan with discomfort. A cracking and creaking came from within him as his body began to stretch, bones extending as he grew taller, soon stretching well over six feet.
The legs on his jeans and sleeves on his shirt pulled up along his limbs, looking ridiculous on his taller body. They then began to feel tighter and tighter, the cloth stretching nearly to breaking point as Jeff's muscles burned with heat and strange exhaustion. They swelled and hardened, weak scrawny arms and legs pumping up to the huge trunk-like limbs of a long time football player.
With a long, slow tearing sound, his clothes finally gave way, shirt ripping apart and jeans breaking at the seams. Jeff looked down at his chest, which was still widening, and watched as his muscular pecs bristled and itched, black hair growing and spreading to become a manly pelt.
Amazed, he lifted a hand to his face, wincing slightly as it creaked uncomfortably, growing like the rest of him. His skin toughened and became rougher and calloused, as the black body hair grew out on the back of his powerful worker's hands.
His shoes felt painfully constricting, and he leaned down to pull them off, just in time to see his growing feet break through his socks, tearing them to shreds. His muscular, wide feet beneath were as hairy as the rest of him, and he wiggled his toes as he admired the change.
Quickly tearing off the scraps of his torn clothes, Jeff ran to his mirror, looking himself over. He was wearing only boxers, tight over what he could tell was now a much more endowed package, and his body was the muscular hairy form of a much older, stronger man. As he admired himself, his face began to change too, chin widening into a square jaw, soon covered with bristling stubble. His eyebrows thickened, and his skin darkened slightly, giving him a much more mature, handsome exterior.
Finally, Jeff shuddered as a slight feeling of weight and tiredness settled gently on him. His stomach bulged a little, rounding into the hard musclegut of a strong older man who had let himself gain a little weight. His hair and stubble grew a few flecks of grey, and his skin felt thicker and rougher.
A breeze fluttered through the room, and suddenly Jeff was wearing boots, jeans and a flannel shirt over a white vest. He stared at the mirror, into the eyes of a man at least his father's age, and suddenly realized he really badly wanted to watch the game with his best friend.