Not Enough Dash

Contains blue fast horse as the title implies, and poking lady bits along with immobility
Thank you O Blessed Writefriend for the gracing of this tale upon us

>Day 66^100 in Equestria
>You've been here too long, but life still goes on
>You're still Anon, some human who found himself in horse world and dealt with it
>You almost feel like the past year or so didn't happen, as if you've been in statis
>Odd that
>You consider contemplating that more untill you hear a large thud shake the whole house
>Finish putting your sharpest suit on as normal and rush downstairs

>In your doorway lies a blob
>Well, you HAD a doorway
>In place of the doorway was a light blue blob, comically jammed through a broken wall
>The colour was the only thing you could say was 'light' about it
>You notice a patch of rainbow hair at the top, and the feathers from part of a wing
"...Rainbow Dash?"
>"Yeah. Hey, Anon. Been a while."
"You... How did you even get so..."
>"Big? They put one of those... Fast-food places up near Cloudsdale. Didn't even need to fly down here to eat... Got too heavy for my cloud so just glided down here."
"You can't even fly anymo-"
>"Can you just let me in?"

>It took half an hour of you and Applejack (Who seems to be the only pony who's stayed her normal size around here) pushing and pulling to move Rainbow out of the wall and into your living room
>Each point of contact on Rainbow's body leaves her seemingly endless flab rippling and waving, whatever workouts she had kept doing were clearly out of the window
>Once she was unwedged from your new, widened doorway, each step she was able to make left her stupidly breathless... She wasn't even the one doing most of the work
>Applejack sighed and unceremoniously trotted out once the deed was done, never to be heard from in this story again
>Rainbow is now the centre of your living room, her belly spilling out beneath her enough to encompass your rug, her well-endowed wingspan only good to glide on with her new size, her hooves fighting for contact with the floor
>Those flanks have swollen out enough to dare touch the ground as they sag down, filled with nearly 2 years of constant indulgence
>Her cutie mark is stretched out enough to be seen as an advert more than a mark
>A small amount of sweat is seeping from the many rolls of fat adorning her large, barely-mobile body.
>She's only just fully regained her breath now, and is smiling at you as she catches you walking around her, mirin' her gains
"So... Now what?"

>Rainbow giggles, her entire body rippling as she does
>You swear you see her flanks make momentary contact with the carpet as that happens
>"Well, could I ask for two favours?"
>You raise an eyebrow
"Go on?"
>"You got any food around? I'm starved."
>Well... She isn't.
>But her stomach is so stretched out from the constant overeating and gluttony she simply couldn't be satisfied by eating regular amounts
>She's barely able to move a hoof by herself too... Looks like she's at the point of no return, doomed to be a big butterball.
>You sigh, still keeping the handy context-sensitive fridge around and pull a nicely-sized cake, putting it on a table in front of her so her flabby cheeks and chin can still reach
>Her mouth opens, drooling with content, her having to force herself to stop eating momentarily as she's so pre-conditioned to do with anything her eyes lay on
"And the other thing?"
>She giggles again slightly
>If her flabby front hoof could reach that far you'd imagine herself awkwardly scratching the back of her head at this point

>"I... Haven't been able to pleasure myself for quite a while now."
>You look at your arm, then at her flanks
>She notices
>"...Yeah, that would do."
>She couldn't spread herself out wide enough to present if she wanted to.
>You're going to have to do some digging.
>You roll up your sleeves and get to work, penetrating inbetween her violently jiggling flabby globes of fat with your arm to find her lost pussy
>She starts gobbling at the cake, working up a slight sweat at her front again and allowing her entire body to ripple and undulate as if this is the only workout she gets anymore
>You find her quivering pussy as your arm is elbow-deep, and only a gentle finger is required to send her over the edge, her own eating and fat rubbing against her leaving her so pent-up.
>You start to remove your arm already, before she stops eating.
>"No. Stay there... I-I need more..."
"More food?"
>"More of everything..."

>So this is your life
>Pleasuring a once-athletic pegasus that's now trapped in her own prision of soft fat and can only continue to eat and grow even fatter
>You only stop pleasuring her to get more food as she starts to demolish more and more monstrous-sized portions of food
>Her stomach swells by the day, demanding more and more to be satisfied, to the point she only stops eating to sleep
>Your arm needs to reach further and further as her entire body grows out, any chances of self-mobility long-lost
>You even started to become skinnier, as you spent so much time acquiring her food and working for her you never got the chance to eat a normal-sized meal for yourself
>Even though she was trapped, the beauty of her ever-growing fat in your eyes left you as her personal slave, as she was queen of gluttony.

SHE ISN'T ISLAND SIZED YET THERE'S STILL ROOM FOR HER TO GROW