Jake has always had a strong attraction to his father's big hairy feet. He'd spend hours jerking off to the image of licking them and rubbing his cock along their soles. He decides that he will finally do something to achieve his fantasy. He finds a site on the dark-web that promises to deliver him a remote that can swap any 2 body parts on different people, as well as completely disconnect people from their parts or body-swap them completely. He immediately clicks "buy".
The device arrives and he decides to test it as soon as possible. It is basically a smartphone with a small interface where he can input different details. His first thought is to try and swap something with his dad, since he is asleep at that time anyway so he won't notice.
Jake inputs him and his dad's name, and chooses to swap both of their feet. He pressed enter. At first he thinks nothing has happened, as he didn't feel anything. But then he looks down and notices something. His feet were now much much larger, going from a size 8 to a size 14. His tops were covered in thick black hair, and there were so many visible veins over them. It was such a strange and arousing image, his normal feet, which barely had any hair, stopping at the ankles, and immediately transitioning to these huge big manly feet.
He stretches in bed, jerking off while looking at his dad's soles reflected in his bedroom's mirror. He starts wiggling and stretching his dad's toes, sending him in an orgasmic convulsion. The pleasure he felt was insane. He grabbed one of his dad's feet and pulled it towards his cock, rubbing it against the leaking precum. The sensation he felt both on his cock and from his dad's feet at the moment they touched made him cum on the spot, covering his dad's foot with his sperm. He went and showered his dad's feet and thought about what he wants to do next..