Don reached down with one finger and gently rubbed the fur on his father's front. The normal mass of hair was now thin and delicate beneath his touch. Paul closed his eyes and resumed his stroking. Don watched as the small muscles -- arm, shoulder, chest -- worked. Don's fingers followed, and gingerly he stroked his dad's shrunken prick between his thumb and forefinger. "Well, you do seem to be enjoying yourself," Don said. "So why don't you shrink another time for me?"
Paul sighed as he felt his size leaving him. His dick retracted from Don's fingers, and the denim slid beneath his legs. Every part of Don grew by more than 25% as Paul felt his remaining inches fade away.
Don let go of Paul's dick and lifted the little man up in his hand. The skin of Don's hand was hot, and Paul felt his backside beginning to sweat. Immediately, Paul went back to work on his member -- which to him seemed the same large inches it always had. Don lifted his father up near his table-sized face. "Dad, your dick has been hard the whole time. Is this turning you on?"
Paul felt a shiver, as he thought of rubbing his dick all over Don's giant face. "Y-- Yes," Paul squeezed out. His teeth were starting to chatter from the sexual energy. "The smaller, the hornier."
"And to get you back?" Don asked. Dad seemed to have all the answers. That was odd.
"Cum!" Paul shouted, moving forward along the palm toward Don's face. For a minute, Don thought that maybe HIS cum was needed, but then he reflected on Paul trying to get off in the laundry basket. He was obviously useless at this size, but maybe when he was back to normal Don could get the answers he wanted.
"In that case," Don lifted Paul up and licked Paul's once-giant balls with his tongue. "The best thing is probably for you to shrink even more." With his sensitive tongue, Don probed the shrinking man's crotch as he dwindled and shook.
Suddenly, Paul seemed very heavy. Don tipped over as the world was all at once hairy and hot and muffled. It took a second to orient himself, but Don realized his nose was buried in his father's balls, a long, thick, slowly throbbing erection pressed against his forehead.