Pinkie began with her explanation. "Let's get fat. It can't just be me who's fat, we'll both be fat together, won't we Dash! We'll both come down here in late hours and smother ourselves in cake, eating it until we pass out. And you seem to like staring at my belly, so I thought you’d need your own to look at too! So wadd’ya say?” As Pinkie leaned over, her soft fat pushed against Rainbow Dash. The warm, thick belly smothered out on top of her, and Dash began to envy the pudginess. "FEED ME NOW" she helplessly blurted. She went to shove a hoof in her mouth as if the words slipped out, but the restricting chair made her unable to move. "That's what I wanna hear!" said Pinkie happily. "Here's the first cupcake. Extra fatty, sugary, BUTTERY icing, with luxurious thick cake inside. 50 boxes of these will destroy your fitness! Now open up!"

Dash opened wide, as Pinkie slid the first cupcake into her mouth. Leaning on top, she elegantly closed Dash's mouth. "Now enjoy..." she whispered. Rainbow Dash became so disturbed by what she was doing, but she couldn't stop herself! The satisfying feeling rushed through her body, as the smooth icing squished against the sides of her mouth. It was so wrong; the cake was clearly full of fat and enough to ruin her flying ability, but she kept chewing. "I know it's hard, Rainbow Dash. Sometimes you just have to let go, leave your flying days behind." Pinkie approached Dash's open mouth with the next cupcake. "It might feel wrong at first, but you'll accept your growing belly. Just say goodbye to the wonderbolts, and all the training you did for them, cuz you'll grow into my big, chubby, cuddly friend!" Rainbow Dash now felt even more scared and creeped out, but the arousal swallowed up that feeling. She imagined herself trying to fly, unable to do what she used to love doing. She pictured her belly bouncing around, the tight wonderbolts' suit only stretching halfway down her body.

Oh, how she wanted that figure. Huge rolls of fat tumbling down her body, and two plump wings sprouting through the thick folds in her back. All she had was a thin, streamlined shape, soon to fatten up into her new dream. "When did you last perform a sonic rainboom? " asked Pinkie. Dash didn't want to speak; she needed to be eating efficiently. "Last week" she mumbled, her mouth stuffed with creamy delight. She knew that was the last rainboom she would ever perform, as her bloated stomach began digesting the cakes into fat. "I can feel the pounds coming on already" she said with satisfaction.

Her stomach grew with every delicious cake she ate; Dash went through chocolate, vanilla, toffee, banana, she couldn't even remember the rest. All of it blurred into one indulgent sugary feast, fed to her by a chubby pink pony. Her bloated stomach was nearly as big as Pinkie's empty one, but she kept fighting the pain in her stretching belly. Every time she swallowed, another mouthful of cake stretched out her stomach and forced her body to process the fat. The inner stomach was expanding, more room was made for extra cake. Rainbow Dash demolished every gateau and cupcake in sight, her stomach gurgling and grumbling for more. The whole store's cake supply ran out, every treat was tightly crammed into Rainbow's giant, growling belly. “Uggggh I’m so full...” she moaned.

"Oh, sounds like your fitness is going to good use, Rainbow Dash! Instead of flying around, those strong muscles are breaking down all that cake. And soon, they'll be holding up your flabby ol' belly!" grinned an evil Pinkie. "But you don't want them to starrrve, working on all that tough... digesting... work…" Pinkie tumbled on her back, her enormous belly wobbling around at the same time. Pinkie pulled her face down at the thought of the work, making a scene like usual.

As she jiggled to the fridge, she pulled out a whole litre of thick, creamy milkshake. "Here, this'll help them out! It’s my old milkshake recipe, but with added calories this time!"

Approaching the cyan mountain that was Rainbow Dash, she shoved a large tube into her mouth. Pinkie stood on a high-up chair, and began pouring the slimy, gluttonous milkshake into it. Rainbow closed her eyes as she sucked on the fattening drink, the liquid swirling and spinning inside her. This was it, her flying days were over. She would wake up the next morning with a towering, plump belly, anchoring her to the ground. Dash just accepted it; the sky was not for her any more. The wonderbolts would stop hanging out with her, and she would instead indulge in nightly feasts with her pudgy pink friend. THIS was for her. A life of wearing tight plus-sized clothing that barely fit her, and caressing her fat body all day long. The healthy past swashed away like the milkshake gulping down her throat, and her belly rumbled a moan of satisfaction. The sugar had filled her body with vibrant energy, but this time she wouldn't be using it up. Soon her organs would adapt to her new routine, and any calories would go straight to fat.

Dash remembered the day before; all the fantastic stunts she performed in front of the eager crowd. She had flown to the sky and back, spinning and circling around like no other pony could. That was real talent. But looking at her stomach now, the future didn’t look very athletic. All these thoughts weren’t even bad; they turned Dash on. Going from thin to fat; athletic to immobile. She pictured herself flying again, and barely being able to lift off the ground. Someday her wings would be swallowed up by her fat rolls; she’d look like a giant balloon!

"Now, I don't want you moving and burning calories, so you'll be sleeping where you are." advised Pinkie, sounding sensible for a change. Rainbow Dash agreed, and they soon went to sleep. Pinkie hadn't eaten much, but that was okay, as she generously gave the feast to her Rainbow-coloured friend. All night they dreamed of their amazing fantasy, and Dash's belly slowly transformed from solid and bloated to squishy and fat overnight...

Next Chapter: Chapter 4 - Finally Fat Estimated time remaining: 3 Minutes