Although initially slowed by his erection, Matt began to pick up speed, determined to make up for the lead his sister now had on him. Angela wasn't doing so hot now, however, as her continuously growing hair was slowing her down, as she had to roll it up again, every once in a while. Matt soon caught up to her, at least until they both hit transformation pads.
Angela felt a tingling throughout her body, mainly around her chest. Her breasts began expanding, going from her normal B-Cups to much larger D-Cups. Angela was elated at first, momentarily regaining her balance, until the changes progressed. A second pair of breasts sprouted right under her current ones, and all four of her nipples became erect, becoming larger and turning pink. Angela could only keep running as her boobs began to lactate, milk dripping through her shirt.
Matt smirked to himself, gaining the lead, until his changes occured. His body tingled all over, as his legs began to grow fur. They began to resemble hind legs of a kind of marsupial as his feet began to lengthen, gaining paw pads and the like. A furry tail extended from his back as well, as he began to go from running to unevenly hopping.
"The tail and legs of a kangaroo?" Matt said to himself, not sure how to hop with these new appendages. "Let's just hope I don't gain a pouch as well!"
"Anything's possible!" Serena reminded him as he slowly began pull ahead, Angela struggling to keep up.