Jeff eventually decides to merge with his uncle, Daniel. His Dad wasn't home, so he decided to call his uncle and ask if he could come over for a while. He agreed, and by the time Jeff heard the doorbell ring he had set up the Chronovac to merge them the next time they touched. He set the merging time to five minutes, he set the mind of the combination to be 75% Jeff and 25% Daniel, and for the change to be pleasurable for both of them.
He ran down the stairs to open the door for Daniel, and struggled to hide his boner as his uncle shows up in a tank top and Under Armour tights, clearly just coming from a workout. Daniel smiled and said 'Hey, Jeff,' as he was ushered into the lounge. Jeff followed him as his uncle sat on the sofa and put on the sports channel. Jeff sat on the sofa beside him, being careful not to touch him just yet. He took a deep breath and asked Daniel for a hug. He replied 'Sure, bud,' and wrapped his hulking arms around his beanpole nephew. The moment their skin made contact, they both felt a sudden orgasmic wave of pleasure, prompting them both to moan loudly. Jeff sat on Daniel's lap, feeling his massive erection though the tight Under Armour. The first thing the start merging was their legs. Jeff felt his uncle's size 12 feet push into the back of his feet, his feet wrapping around Daniel's like putty, and saw that the two now had the same massive size 15 feet. He felt a tickling feeling as a light coating of curly ginger hair appeared on their new feet, clearly from Daniel. Jeff's small lower legs were pushed back into Daniel's massive calves, together expanding them to the size of rugby balls and ripping apart both Jeff's jeans and Daniel's tights. As their thighs became soft and squeezed together, Daniel's cock was forced into Jeff's tight asshole, making Daniel moan loudly and Jeff gasp for breath. As their thighs were now solid and huge, the changes moved to their groins. Daniel's monster cock was swallowed up by Jeff's butt and merged with Jeff's throbbing erection to become a foot long erect, as thick as a soda can. The sudden changes to Jeff's sensitive cock caused him to shoot the biggest load of his life all over the TV, as their groins squeezed together and Daniel's ass expanded into a perfect bubble butt. Now sharing the same muscular legs, Daniel's torso pushed through the back of Jeff, swelling up his now massive pecs and pushed out a new, meaty six-pack. Their arms then swelled together to create new, outrageously sized biceps and thick, veiny forearms leading to long, thick hands and fingers. Their shoulders crunched together and swelled to be able to support their new heavy arms. Finally, their two heads started merging. Daniel clearly had the dominant genes as the new face kept his strong square chin, wide nose, and short ginger hair and beard. However, the face also had Jeff's blue eyes and light dusting of freckles. The new man stood up, and found a mirror in the lounge. He admired his new bodybuilder-like body, but still lean. Looking at his own reflection, he jacked himself off, eventually spurt volley after volley of thick white cum, more than what the two previous men could create combined. Suddenly, Daniel's compression tights and tank top appeared on the new man, adjusted for his massive size. He felt dizzy as he found himself in a busy gym, attracting looks thanks to his new snake clearly visible through his Unser Armour.