As Jeff ran round the block, Justin was flexed with every step. This feeling was oddly satisfying and he tried his best to support Jeff... which wasn't a lot. After taking a turn they met Mark. "Hiya Jeff, how's it going" "Fine. You won't believe what happened to Justin." "What happened?" "I'll show you at my place", he said as they arrived at his door. Rushing upstairs Jeff finally took of his shoes, placed them in front of him and said, "This is Justin".
Mark started to laugh. Jeff clearly must have made a joke, but then the sneakers changed, they somehow started to loose their definition turning into blobs growing upwards like tubes. At some height they started to merge forming an upside-down Y. After some moments arms and a head formed, creating a vaguely humanoid shape. As the last change all the details grew in, forming Justin in the flesh. Realizing his was nude he quickly put on his underwear. Unbeknownst to all of them, his shoe size still was at the palm of his feet.
Mark was stunned as Justin asked, "Wanna see how that works?" Silently he nodded. "I hope you don't mind Jeff", he asked his friend. "Well it's only fair for me to be the 'victim' this time", Jeff said. Justin sat down in front of the computer and did some settings.
Jeff took a deep breath as Justin started the transformation. Quickly he shrunk out of his clothes and became a small disc-like blob which turned doughnut shape and flattened into a band. It turned blue, and on its front a pair of goggles appeared. To the sides a pair of fake wings started to grow. Justin picked up Jeff and spun him on his finger before putting him on.
"Wanna have a go, too, Mark?"