You stamp your foot once more, now thudding loudly as the hoof it has become. Your girlfriend was still on the ground before you, moaning loudly and groping her swelling tits, massaging the thick cum into her skin. Her tongue was flicking out, lapping up the viscous, stinking jizz from her face, the thing growing longer with every lick, a deep black brown beastly color spelling over it. Just this action alone was enough to keep you hard, let alone her own growing musk invading your nostrils, or the sensation of more cum churning away in your swollen nuts.
You approached with a swift clopping, your hands easily wrapping around her gym soaked head and pulling it in close to your musky crotch. She eagerly began to rub her face and growing tongue along your stiff donkey shaft, her own moans starting to come out as more bestial grunts and snorts, a soft braying tainting her voice.
"Fuck, you were always such a prude. Look at you now, acting like a real donkey slut now!" You exclaim as her hand reach up, fondling your over swollen balls. Her hips buck as you speak though, raising her ass higher into the air, the skin tight leggings looking thinner by the moment, seams pulling apart as her ass swelled.
"Fuck! Yeah, donkey slut, Mmmmm..." She responded, seemingly only half thinking of what she was saying. She bucked her ass again as the seam down the center pulled apart, revealing the light fuzz spreading over her skin there, along with a growing bulge at the base of her spine. Her hands left your testicles to return to her body, one groping her stil swelling tits, thick black nipples throbbing in the chill air. The other slide between her thickening thighs, under the hem of her tearing leggings to begin quite loudly playing with her oozing, changing cunt. The smells from it only strengthened as she fondled herself, and your nostrils flared wide at the scent, your hips bucking forward involuntarily.
It was just to much, and you had to pull your new cock away from her despite her whining protest. You didn't leave her wanting for long though, as you swiftly strode behind her, your hands gripping her growing ass, helping to peel away what remained of the torn leggings and undergarments. "Mmm, fuck yeah! Fuck me, fuck me right hereeeAW!" She begged, her voice distorting into a halting bray.
It didn't take much for you to agree, gripping her roughly by her growing hips, thick grey fur spreading over them. She lifted her ass for you, and you got a good look at her mutating cunt, the flesh as black as her donkey teats, vulva throbbing as it swelled. A small stream of her musky fluids spurred out against your leg, and you couldn't help but peel your upper lip back as you sniffed it.
In all the excitement it was hard to tell when exactly you entered her, but once you were in it was a hard and sudden pounding. You thrust away with all your body, grunting and snorting away, while she moaned below, her voice tainted more and more with lusty brays. "Ugh, yeah, fuck, that's right! Get fucked donkey slut!" You said, fighting back your own bray, while she rocked back into your cock.
"Yeeesss, fuck meeEEEAW! Fuck donkey slut! Fuck donkeEEEHAAAW!" She cried out as her body shivered, pushing herself back hard on you as her tail snaked out, you feeling her equine cunt grip tightly onto your monstrous shaft as she orgasmed again. You weren't far behind, coming again quite quickly, her moaning so loudly as you filled her. A hand shot to her stomach, stroking over it as it swelled outwards lightly, stretching from the shear size of the load, looking far more donkey like.
You pulled out of her unceremoniously, a small gout of your fun spilling free before her cunt closed up. Stepping around to her front again she pressed her face right into your crotch once more, this time taking the head if your cock into her mouth. She sucked away, eyes half lidded in bliss while you looked down. You heard a soft popping as her ears stretched, growing longer and wider, twisting about as they grew into proper donkey ears. You felt her teeth growing as well, becoming your bucked and prominent, but the actions of her altered tongue and lips, now far more the far and flexible kind a donkey would have, more than made up for any offense her new teeth would bring.
You moaned softly as she continued to please you, running your fingers through her gym soaked locks to scratch behind her new donkey ear. She groaned in pleasure, pushing her swollen tits into your changed leg, while you contemplated what next to do with your new donkey slut.