Steve giggled to himself as he drove the miniature father and son back to his house. Father and son? More like son and son now... Steve felt protective of the tiny guys, as if they were his children. Children he could fuck whenever he wanted. Life was good.
Matt had shrunk as small as his two-foot father and even passed him, settling at about one foot as Steve's erection faded. Steve was still horny but it was hard to maintain arousal while driving. He looked over and saw the two little guys sitting next to each other, looking up at him. Jim's gaze was quite a bit more adoring than Matt's, but they both looked awed. Steve wondered if Jim would grow back... would his shrink-cum wear off? He supposed it would... Paul had mentioned something about Jim being big and wanting his cum. Steve didn't like the thought of a big man after his cum, but he couldn't argue with the results.
The drive home was a little slow because of rush-hour traffic. Steve was bored. He glanced down at his charges and said, "Matt, why don't you sit on your father's lap?"
"Because I don't want to," said the tiny boy.
"Do it!" Steve ordered, realizing he had to phrase his commands this way. Matt shrugged and complied. He looked like a toddler against his father's body... an illusion that was ironic since Jim was smaller than a toddler himself.
Jim smiled up at Steve. He shifted as his son started growing on his lap. Steve still wasn't hard, and Matt was growing back.
"Jim, stick your cock up Matt's ass," Steve said.
"Anything you say!" Jim chirped. With much grunting and groaning, the two tiny guys managed to shift in to the required position. The look of agony on Matt's face faded as he grew larger in relation to his father's humongous dick.
Steve laughed at this, managing to keep himself soft as Matt grew. Soon, the teenager was bigger than his father, and soon, he was much bigger. Jim didn't complain as Matt began to squash him into the seat. He was doing what Steve wanted him to do.