Tim begins to grow suddenly and painfully, bypassing puberty and going into his twenties. "I thought he said 'five'" Tim thought to himself as he grew. When he was done growing, Tim looked down and noticed that although he had grown older, he didn't have any hair below his neck, not even the patch of fuzz that his 12 year old body had developed.
Tim suddenly felt the urge to bend forward as he fell to his knees. He looks up at Allen but his vision is beginning to get very blurry. It appears that the room is getting bigger around him.
Tim tries to crawl away, but finds that his arms won't respond. He tries to turn to look at them, but his neck is becoming stiff and he finds it difficult to turn. Out of the corner of his eye, he sees his shoulder, but it seems slightly closer to his face than it used to be, and he can't see his arm at all.
From Allen's perspective, he could see Tim's neck disappearing and his mouth forming an elongated hole as his hair receded into his head and his face turned pink. His arms had melted into his sides and his legs crumpled into pink masses of flesh. Tim's whole body was about three feet in length now, and steadily decreasing in size. Allen stepped around to Tim's backside, where his 21 year old ass began to transform into a flat surface with a hole in it that was the perfect size for Allen's hard cock, which had become quite excited watching Tim's transformation.
Allen wasted no time sticking himself into what used to be Tim's ass, and he moaned in ecstacy as he felt what was left of Tim's body shrinking and melting around it.
Finally, Tim's body had shrunk to five inches long, and strongly resembled Allen's penis. Tim struggled to speak but only managed to move around a bit.
"You're going to develop a new respect for me" Allen said to Tim, pulling up his tight boxer briefs over his friend and stroking him gently.
"Damn this is hot" Allen said out loud. "What should I do first?"