Arriving at school late for her first lesson she ran up to reception and scanned herself in and then ran over to her class, bursting through the door to see ...
.... that she actually had a free period for the first hour.
"Oh thank fuck for that," Rebecca sighed.
Sitting and slouching at her desk she slumped forward to turn on her monitor. She quickly relaxed back and looked at the can she brought with her. She noticed that it didn't actually have a name on it like the others. She just assumed it was never put on or that it had somehow come off.
Maybe it was just a sticker that peeled off, thought Rebecca.
It was then that she - like Katie - realized that it was actually full of pills and not liquid. Popping one out of the can, Rebecca put it in her mouth and bit down on it. The pill had a nice taste, succulent strawberry with some hint of pineapple or something; it was a great blend.
Then she swallowed it.
Rebecca quickly had an involuntary movement, slamming her face on the desk. She shouted out in pain and then fell off of her chair as she experienced the same pain as her sister, doubling over and spluttering on the floor as a six pack slowly pushed its way into existence. Her arms started beefing up immediately. Her legs and thighs bulked up with woman beef and curves. Her breasts pushed out against their confines - she had reached a DD by now and her bra was at the snapping point. Luckily her top and trousers were loose and baggy so she ended up filling them nicely by the time her somewhat pleasurable transformation was over.
Rebecca weighed in at nearly 145 lbs now, with nicely defined arms with biceps as big as the can she had just used. Her body was on par with a professional female bodybuilder but was contrasted by her now to-die-for curves, large rear and bust that kept her femininity but didn't spoil the muscle she packed on. Slamming her hands on to the desk, groaning and grunting half in pain and the other in ecstasy, she pulled herself on to her feet.
"UGH *pant pant* W-what the fuck?! What happened to me?! I.. I feel incredible!" she shouted, pulling a bicep flex that nearly tore her top sleeves.