"You will *oink* transform into a fat pony-girl, in fact the same weight as me, and nobody but me will remember you changing, the whole world will remember *grunt* you as a large pony-girl".
"Haha your even more of a loser than I thought, you actually think that...." Megan stopped mid insult as she started to feel really weird.
As Jennifer watched with amusement a massive lump appeared just under the rim of her cheerleading skirt, it grew and grew until finally the tip of what looked like a brush appeared out of the top of her skirt. Megan's new tail burst out over the top of her skirt, it was long black-furred (like her hair) and was identical to a horses.
Next her shoes started to expand. They grew into the shape and size of a small plate. Megan could only gasp in horror as her very expensive shoes burst to reveal large hooves. Her fingernails started turning black and thick, then merged giving her two fingers and a thumb.
Then Megan's hair grew, but not just longer it grew down and out of her back in a horses mane, reaching the top of her butt. Finally her ears grew pointed and much larger, sticking out of her head and becoming very big.
Megan was so wide eyed with shock that she seemed to have lost her voice. And finally the second major change happened. Her butt was the first to grow. And grow it did. It expanded and started stretching her skirt popping the seams. Her stomach grew wide and folded over the front of her skirt in a paunch. Her upper arms grew massive, doubling their thickness in seconds. Her legs grew into tree trunks, she developed massive love handles that folded over her skirt. her thighs were almost as thick as her waist each. Her breasts grew past their normal C cup range and entered EE stretching her small cheerleading top tightly.
All the while she was growing in other places her butt hadn't even slowed down, it started slowing down when it stuck out almost 2 feet behind her. And her hips had gown in almost equal amounts, making it a chore to get through doors for her. None of her legs were left untouched, even her calves were almost as wide as the largest part of her hooves.
The changes finally stopped leaving Megan a very different girl. Her breasts were almost watermelon sized and lay on-top of her belly which in turn had several rolls and covered a large part of her thighs, her upper arms were jiggly and soft, but her crowning glory was her ass. it was the size of two halves of a bean-bag chair, and was almost as wobbly, her skirt was hanging on by just the stretchy rim at the top. And her top looked like it was reaching its limit.
Megan looked at Jennifer and it seemed the anger had left her eyes.