Not Big Enough (Donkey TF) (Patreon)

A lot of donkey’s lately, hope no one minds. Grace is having some alone time. As always thanks for the support!

Story:

Grace had locked the door to her private quarters long after the night shift ended. She’d acted so exhausted and tired in front of everyone already that she knew no one would come to disturb her. With giddy excitement, Grace laid back on her bed , pushing her shirt up and exposing her breasts, peaks already beginning to harden in the cool air.

In her hand was her favorite little helper: a shiny pink dildo, smooth and thick enough that it usually made her toes curl.

“Okay, little one,” she murmured, voice soft as if she was speaking to her machines. “Be good for me tonight. I’ve been working too hard… need a little maintenance.”

She pressed the tapered tip against her folds, already slick, and slowly pushed it in.

“Nnnh… ahhh…”

The stretch was perfect. Maybe even a little too perfect. She rocked her hips, letting the toy sink deeper, one gloved hand squeezing her breast while the other held the base steady.

“That’s it… uff… just like that—”

The moonlight shone brightly into her room, her slick glistening. It was all so…so perfect!

Then the first strange shiver ran through her.

Grace paused a moment, “nn..huh..?” Strange…her window wasn’t even open.

CRRkK!

A sharp jab at the base of her spine made her jump. Then it melted into a warm, heavy pull.

“Wh—what the…” Grace propped herself up on her elbows to look, but her attention shifted elsewhere.

Her ears tingled, then lengthened, stretching with a soft pop-pop-pop of cartilage reshaping. Soft gray fur bloomed across her shoulders, her thighs, the soft curve of her stomach. Her hair spilled messily over the pillow as her muzzle pushed forward, nose darkening, lips parting around a soft, involuntary snff, snRt! As her nostrils flared and widened.

“W-what…? Oh no… ohhh no, hhf, something’s wrong with — ahhw— me!…”

Her breasts swelled heavier in her hands. Her hips widened with a deep, creaking stretch of bone and muscle. A long, elegant tail uncoiled from the base of her spine and flicked once against the sheets. Between her legs, the soft human folds were already changing—swelling, darkening, reshaping into a plump mound that pulsed with every heartbeat. The aching nub at its core swelling in tandem, throbbing with her heartbeat.

“HaaAaaw?! M-My body!? What’s h-HAAAAaawwpening to my body?!”, Grace prodded along her body with one hand, feeling the soft fuzz growing along her skin.

But the heat was impossible to ignore, she seemed less concerned about the transformation, and more on what to do to stop the ache between her legs.

Suddenly, the pink dildo felt very, very small.

Grace’s eyes widened a fraction more. Her new long ears pinned back. She tried to rock her hips the way she always did, chasing that perfect stretch—

But the toy barely filled her anymore. It slipped and slid uselessly inside a passage that had grown deeper, tighter in different ways, designed for something far larger.

“Nngh— haaw— no, no, stay… please stay…” she whimpered, voice cracking now, roughened by the new shape of her throat. She grabbed the base of the pink toy with both hands and tried to push it deeper, harder. “Please, little one— I need you to work— haaaw— you’re supposed to be enough—”

It wasn’t.

Every thrust only made the emptiness more obvious. The flesh between her legs throbbed heavily, leaking clear fluid onto the sheets. She winked and clenched around the inadequate toy, trying desperately to hold onto any stimulation at all. The pink silicone looked almost comically small now, glistening and slick and completely unable to reach where she needed it.

Grace’s tail lashed in frustration. “Damn it! C’mon…” She kept trying anyway—hips rolling, soft desperate panting spilling from her muzzle, one hand still squeezing her heavy breast while the other worked the toy in short, frantic strokes.

“Come on… please… just a little more… so close, I just need—”

The toy slipped free with a wet schlick and landed on the sheets beside her, shiny and useless.

Grace stared at it, chest heaving. Her new body was aching, empty, and far too big for the only thing she had.

“…Ugh,” she whispered, soft and lost. “Not big enough anymore.”

She lay there in the quiet room, legs still spread, ears drooping, staring at the little pink toy that could no longer help her.