Tammy absentmindedly grabbed a sports bra sitting next to where her bra had landed, but put it on anyway. It seemed to be a perfect fit for her, while the nature of the sports bra compressed her boobs to belay their true size, she could also feel her muscles tingling underneath.
Throwing her shirt on overhead, it somehow felt a little smaller than before; despite the bra holding her boobs back. Still, the quick airing out helped her cool herself down some, as she went back to thinking about what the heck was happening to her, uh, Significant Other? It all started when he grabbed a pair of panties to show her, she thought. But as she moved her arms to put her hand on her chin to think, she heard a loud RIP directly behind her; as her shirt gave way to her newly increased muscle mass. "W-woah" she stammered, "d-did that sports bra do this?" she pondered, looking at the the bra now that her shirt had fallen off on it's own. She felt... stronger, but still very feminine. "What if I..." Tammy trailed off as she reached for...