Liz lines up and smiles, signaling you over. Lining up next to her, you give her a smile right back. "OK, are you ready?" you say, giving yet another grin.
"Ready as I'll ever be." She responds, chuckling inwardly at the new swell of your chest.
"OK, Ready...Set...GO!"
The both of you take off full speed, and despite the weight on Liz's chest, she immediately dashes ahead of you, the finish line grows closer and closer, and for a moment, you start to worry about whats going to happen. Suddenly though, Liz stumbles, falling to the ground. Passing her up quickly, you cross the finish line, letting out a triumphant cry "YES!"
"Congratulations" Liz says, walking up slowly, upon turning around, Liz has her pants un-buttoned, a long shaft starting to grow out from her hips "mmph" she grins again, having planned her loss the whole time. The shaft grows to at-least 8 inches, throbbing in arousal
"Hey, wait a second" you reply, looking worried "What are you doing?"
She laughs, responding "Mmm, you just look so pretty with that little chest of yours" she pulls you up against her, turning you around "I can't resist" She says, before yanking your running pants around your knees, cock pressed between your cheeks.
"Hey, Liz wait a second" You plead "I've never..."
She interrupts "You always win...but this time I get the prize" She pushes forward hard. Maddie and Amanda, now back to their normal selves, watch with wide eyes from a good ways back.