It Runs in the Family

Earlier...

Sharon’s willpower was fleeting in the face of her mother’s erotic pose and exposed pussy. With Robin still sucking upon her tip and jerking her shaft, her hormones were taking over and it was growing more and more difficult to think of a reason why she shouldn’t fuck this ripe and ready mare with every passing second. She shifted her feet; her heavy testicles jostling her thighs as she leaned forward while sliding the shower door open more to breath in the heady aroma of Suzanne’s sex.

While Sharon had to deal with her issues regarding sex with her mother, Suzanne had no such qualms. But then she was a nymphomaniac, a particularly horny one at that.

When her daughter had invited her into the bathroom, her pussy had tingled pleasantly at the opportunity to see Sharon’s hot fuckable body all covered in suds. Most people were prudes and had a ridiculous number of taboos in regards to sex. That Sharon was Suzanne’s daughter just made the whole thing even hotter. Sharon’s ‘helpful’ comment had only stoked Suzanne’s libido as she realized her daughter was more like her after all. She’d quickly shucked off all of her clothes to give Sharon a real show. Hmmm… perhaps a better birthday present for her daughter would be some really nice sex!

Suzanne turned her head a bit to better appreciate her daughter’s nude form as she let the shower door slide open some more. Sharon had a lithe body, much less busty than her older sister’s. But there were still plenty of graceful curves and Suzanne greedily eyed her up and down. Sharon’s hips were still obscured by the glass but the milf noticed a tell tale rocking of her hips and she smiled wantonly. Answering a need that had been building over the last few minutes, she reached down between her legs. She rubbed her inner thigh as if relieving an itch but her fingers soon slipped into her soaked cunt to spread her lips wide invitingly. Oh fuck! Having Sharon see her lewd pussy like this was so hot!

The combination of her mother’s fingers opening her pink slit and the sexy ‘come hither’ expression upon her mother’s beautiful face was too much for Sharon. Ignoring Robin’s slurping lips; she jerked it out of the girl’s mouth, not noticing the way her abrupt action knocked the big titted bimbo’s head back into the wall. Pushing aside the shower door, Sharon’s mind was in a haze of lust and need. A shiver shot down her spine and her hands actually shook as excitement filled her every cell in anticipation of finally fulfilling her long held fetish.

Stepping out onto the bathroom rub, her equine phallus swung and jerked between her legs its movement completely out of sync with her fat aching testicles as they bounced and rocked. Despite how desperately hard she was, her horse cock hung at a forty five degree angle downwards straining under its own weight. Every so often her low hanging sack would jump and slap the underside of her meaty organ, drawing out a sharp gasp from Sharon’s throat at the sensation. It was only a few feet but the trip felt like an eternity as her nostril’s flared sucking in Suzanne’s musky thick aroma and her head was filled with images of the long awaited act she’d often fantasized about.

Sharon’s shaft, just short of her bulbous head, gently jounced against the inner side of Suzanne’s left knee as she finally found herself just behind her mother’s upraised and slightly wiggling rear. Her hands hovered over the fleshy well curved bottom hesitating one last time as her mother made a play of scrubbing the sink, her auburn hair flicking back and forth pulled as it was into a pony tail that immediately reminded Sharon of a mare’s tail. Finally, she took each of her mother’s cheeks in hand and dug her fingers deeply into the pliant flesh.

Suzanne instantly let out a low whorish moan and arched her back in response, “Oh Sharon! MMMmmhmm… I see my little girl takes after her mother after all!”

Sharon was far too gone to make sense of Suzanne’s words, instead the equine hormones her immense straining testicles were flooding her brain with caused her to hear an accepting horse-like whinny of need. Her left hand slid down Suzanne’s cleft and fingered the dripping slit. The mare’s warm and wet pussy squeezed her fingers as if in welcome and Sharon groaned as her cock let loose a spray of thick pre-cum on the tiles between their feet. Her demanding need to fertilize this willing womb was growing ever more insistent and she reached down with her right hand to grasp her cock just behind the flared tip, having to bend down to do so, her abdomen making searing contact with the broodmare’s rump. She stepped backwards so that she could line up her equine prick with her mother’s pussy and soon her fist-sized helmet was bludgeoning Suzanne’s entrance rhythmically.

Robin watched from the shower, stroking her nine inches slowly as she watched the erotic scene before her, imagining that it was her about to fuck that slutty nympho milf. She giggled softly as she watched Sharon try to fit her massive horsey cock into her mother. She softly muttered, “She’ll never take it…she’d have to have a…” she paused as she tried to put the image in her head into words before settling on an uncreative description, “..massive horse pussy!”

The ring upon Robin’s finger flared with green light and Suzanne gaped as all throughout her torso, she suddenly felt inexplicably tight, almost taut as if her insides were pushing outward against her skin. In fact her most of her organs shrank and squeezed closer together as her ribcage expanded. Her vaginal tract began to convulse and push its way up through her body as it expanded. Her entire reproductive system grew as it rose within her body pushing past other organs as they shrank to make room. Suzanne’s ovaries pulsed and swelled. They grew quickly; starting as almonds they didn’t stop their expansion till each was nearly the size of a baseball. Suzanne’s height actually grew by three inches as her body accommodated her expanded equine anatomy. She had little room for fat and what she had migrated to her breasts and rear, being a milf her waist remained tight and waspish, her abdominal muscles forming a clear yet feminine six pack as they were **** up against her skin by her internal changes.

Just as with Sharon’s change, Suzanne’s memory was adapted to reflect not just her own transformation but the ring’s most recent and related uses. In this case, the fact that she now had a horse’s reproductive system went hand in hand with her youngest daughter’s similar anatomy.

Sharon felt a brief moment of consternation as it seemed her cock’s blunt tip was simply to wide to even penetrate her mother’s dripping slit the slightest bit, when suddenly Suzanne’s cunt almost seemed to open and swallow the first four inches of her shaft causing her to grunt and gasp at the totally new sensation of having her meat surrounded by warm welcoming twat. Suzanne cried out herself in a wordless scream of long pent up release as her large equine vaginal passage finally felt the great girth it had longed for.

In the present...

Suzanne, gasping for breath, turned and sat with her hips perched against the sink, her legs widely spread as a torrent of her daughter’s spunk flowed freely. She gazed at Sharon, now sitting upon the toilet, with fondness and open admiration for her magnificent prick bending across one of her thighs, “Baby, I’ve been waiting for that beautiful thing for eighteen years. I’ve never been filled until today…” she sighed loudly.

“Woah... That's a LOT of jizz.”

Suzanne’s eyebrows rose, for the first time noticing Robin’s presence. She did a slight double take when she saw the girl’s cock. It seemed there was more to her daughter’s friendship with Robin than the girl’s world class jugs. Being a nympho, Suzanne’s next action was clear as she eyed the girl’s straining dick, “Go ahead and bring that over here.”

Robin didn’t need to be told twice and was soon lining up her cock with the milf’s gaping pussy, with a wet slurp her nine inch behemoth slid inside. Suzanne leaned back against the mirror and enjoyed the mild pleasure of the girl’s cock massaging the front of her vaginal passage. The bimbo was oblivious to Suzanne as her sexy well curved bottom pistoned furiously between the woman’s widely spread thighs, her big tits bouncing and jumping with her movement. Sharon’s post-climax stupor finally lifted and her voice lifted as she noticed what was happening, “MOM! What is she doing there?!”

Suzanne rolled her head lazily in Sharon’s direction, “She’s fucking me, honey. Why didn’t you ever tell me Robin had this?”

Sharon screeched, “MOom! I said it was mine! What if she knocks you up?!”

The hot milf sighed inwardly. This was the problem with dealing with non-nymphos. Obviously, she was going to give her studly daughter all the fucking she needed but she wouldn’t be restrained by a prude’s morals. She had an idea how to mollify her possessive daughter and laughed, “This little thing?! Please. She’s only three inches longer than your father tops. I had to be invitro-fertilized to make you and your sister.” Leaning forward so her own substantial breasts were pressing against Robin’s heaving pair, she reached down and cupped the girl’s swinging testicles, one in each hand, “And there’s certainly not enough sperm in these tiny things to do the job. Honestly Sharon, all she’s doing is keeping all your lovely horse jizz inside me, nice and frothy…”

Suzanne saw her daughter’s phallus push a bit out of her sheath during her words and she knew she’d won, especially when Sharon smirked a bit, “Fine…but I don’t want her to cum insi-“

Robin suddenly seized up and froze with her prick buried inside Suzanne, her asscheeks clenching and unclenching furiously as she spewed. Suzanne smiled at Sharon, “Too late. She seems to have a bit of a premature ejaculation problem.” Glancing at her watch, she continued, “About four minutes. You were going for a little over an hour, baby.” She was laying it on rather thick but she really wanted Sharon to relax about her fucking other people. She was a fucking nympho fro cry-sakes!

Sharon seemed to appreciate her mother’s efforts before her eyes suddenly bulged, “An hour?!”

As if in response to her declaration, the doorbell rang as the first of the guests arrived.