You sat down on the couch next to him, curious as to what he meant, but before you could ask, he fired the ray at you, it's coloreful light hitting you, sending tingles through your body. When the light cleared, you looked around. You didn't feel much different.
"Wait for it." he laughed.
"Wait for...ohhhhhhh" you said as the tingles intensified. You then saw the world beginning to grow, especially Jack.
"You are shrinking me?!" you gasped. Your clothes began to slip off, leaving the dirty things sitting on the couch in a pile. It felt so strange, as if your body were collapsing in on itself, folding down to a smaller shape. Your new large butt remained big and wobbly, but you were now almost only a foot tall, and still shrinking. Your cock felt hard though, the thought of changing now turning you on.
"What next?" You squeaked up at him as your reached about 8 inches tall.