Having the erotic idea of trading dicks with his father, Jeff knew he had to make one change to himself first. Using the chronovac Jeff adjusted his own dick to be only 1 inch,1.5 hard. He watched his dick shrink to an embarassing size, but knew he wouldn't have it for long.
Jeff used the swap body parts option to trade dick and balls with his father, Jack, who was sleeping in his room. Making one last change to himself, Jeff became invisible and inaudible to others, and went to his father's room to watch his reaction to having Jeff's small penis as his own.
Unable to be seen or heard, Jeff had no worries sneaking into his Jacks room. Jeff looked at his sleeping father, who was wearing nothing but white briefs. His father had a masculine hairy and muscular body, but where there would normally be a big package, there was the shape of two average 16 year old balls, above which poked a nub of a penis. Was that his father's morning wood? Noticing that enticed Jeff, and he felt his dad's dick rise in his own shorts. Jeff decided to strip down naked and experience how his father's dick felt while he waited for Jack to awaken.
Feeling his dad's 9 inch meaty cock in his hand was insanely pleasurable, and with the other hand he cupped his dad's big balls. Jeff found himself staring at his father's briefs, wondering how he would react to his recent change.
Suddenly Jack awoke, and stretched his beefy arms in the air. Getting out of bed he looked at the bedroom mirror, and noticed that his package didn't look right, considering he had a boner.
Jack took his briefs off and was shocked by his small member. This was exactly the reaction Jeff wanted, his father was clearly embarrassed by the change. Jeff moaned with pleasure knowing that his father couldn't hear him.
Something changed about Jack's reaction in the next couple minutes. He was enticed with his small penis and started playing with himself. Seeing his father reach climax with his tiny penis on his huge body made Jeff release his load too.