Original 3: http://www.furaffinity.net/view/20146015/

First Part: http://www.furaffinity.net/view/27293987/
Part 2: http://www.furaffinity.net/view/27306497/
Next part:


The two mares continued to grow bigger and bigger by the moment. Rainbow Dash soon found herself unable to think of anything to say as the sight and feeling of her muscles and abs soon mesmerized her, growing to love this feeling as they continued to grow.

It wasn’t until the sound of tearing fabric that caught Fluttershy’s ears did she finally notice what had been going on with her own body. She let out a big gasp as she suddenly grabbed at her expanding bulk, a heavy blush covering her face.

“D-Dash! M-My clothes!”

The cries from her friend finally snapped Rainbow from her trance, allowing her to take in the situation better. Shy’s expanding pudge had begun to put a bit of strain on her jogging clothes, exposing a bit of her undergarments. Despite Dash still growing as well, her clothes had not started showing any strain yet.

“W-We're in p-public! P-please help!”

Dash wasn’t sure what the two of them could do. However.... the fact that they both had started changing after they tried out the diet gum was extremely unlikely to be any coincidence.

“I see that gift I gave you Dash has nothing but woe, as it looks as both of you continue to grow.”

“Gee, I wonder who that is.” Rainbow Dash sarcastically thought to herself. Of all the perfect timing, none other than the person that had given her the “special” diet gum stood right before them. It was clearly time to start asking some questions about the situation at hand.