Juan looked at Mr. Mendes, who had returned to adulthood, in amazement. "what the hell...wait," he stopped and looked down at his own naked body. "Something's wrong." He seemed to be shrinking slightly. The dark peachfuzz on his 14-year-old lip and chin began to fade, and the protruding black hair receded back under his arms and down from his navel.
"What are you doing to me!" he demanded, his voice cracking and rising in pitch as he lifted a brown arm to see the last of the hair disappear. Mr. Mendes just shook his head, trying to hide any sign of pleasure at witnessing this reversal of fortune. He had watched Juan grow up into the thuggish Mexican punk over the last few years, but he hadn't seen the changes as imtimately as this. He could feel his own penis begin to swell again at the sight in spite of himself.
Meanwhile, Juan was gaping at the shrinking organ between his legs, which were now also smooth as was his stomach. He looked about 11 as his pubic hair retreated to a mere black fringe around his penis, then fading altogether, leaving him completely smooth.
Still he shrunk, his muscles losing any definition they had. Mr. Mendes recalled that Juan had been a bit chunky as a kid, not fat, but always big, bigger than the other kids.
Finally, the shrinking seemed to stop, with little Juan looking about nine years old. Suddenly they heard voices. Someone was coming.
"You'd better change me back, Mendes," Juan warned in as threatening a manner as he could summon with his child's voice. Just a few minutes ago he'd been almost a man, ready to become a hairy chulo like the uncles he admired at home. Now look at him. "Or I'll scream and let them know we're in here. See what happens when they find us both naked in here. You'll go to jail for sure."
Mr. Mendes realized Juan was right. "Ok, I'll change you back, but not here. Let's go."