You finish first and breathe a sigh of relief that your not going to be turned into someones bra. Liz finishes behind you and Maddi comes in a close third. After a couple of seconds, Amanda comes in, finishing fourth. Then, you all start to feel funny, you look around and you realize your the only changing, because everyone is staring at you. You look down and see that your shirt is beginning to press out. Your newly formed breasts get to an A cup and continue growing until they reach a full B cup. Then Liz starts to change and goes from her previously A cup self to a DD cup, which looks humongous on her body. Then Maddi starts to change. Her legs fold up behind her and she takes on the shape of a sports bra for someone with B cup breasts before she finally shrinks and becomes a bra in all senses of the word, except she still has all of her senses. Then something similar happens to Amanda, except she becomes of the DD size for Liz. You and Liz put on your new bras, this being your first time putting a bra on, Liz has to help you. "How do you like them?" she asks. "Heavier than I was expecting" you respond. She laughs, and says "You wanna make a bet with me for this next part of the run?" "Just between us?" you double check. "Yeah" she says. So you guys decide too...