Lillian didn’t actually hear whatever her girlfriend was shouting behind her. Apparently the reset button for her brain was located up her ass, or maybe that was just generally what happened when someone punched you in the colon. Sarah’s fist had rendered her not only speechless but thoughtless. Propelled into a state of pure bliss. Her subsequent pumping didn’t help either.
Had she been able to string together a thought Lillian likely would still have been too preoccupied to note that Sarah was massaging an increasingly sensitive lump with every piston of her arm. Every time it was stimulated an electric buzz coursed rebounded around inside of Lillian like the ringing of some aphrodisiacal gong. It touched every part of her as it rang through her body before ultimately collapsing back in on itself. The impact was focused right on her winking clit which it struck with the force of a jackhammer.
The first few blows had Lillian’s urethra merge with the pulsating bud until the hole was situated directly on the tip. Then it grew bulging out until it started to grow long. A new clit formed and then budded off the base of the lengthening shaft as it began to migrate up. It separated itself entirely from her horse puss, the skin at it’s base bunching up into a sleeve. The brown color of Lillian’s horse parts proceeded up the rest of the shaft as it continued to gain length, a ring forming about it’s middle and the head blunting into mushroom capped head.
Sarah had seen pretty much the entire process up to this point and stared dumbfounded.
“A dick…” she said, again. “Lil, you’re growing a dick.”
Sarah was having her own problems as her crotch performed gymnastics under her shorts. She pressed a hand to her groin and could feel her own wetness through the fabric as well the swelling nether lips. Awkwardly she used one hand to force her pants off as she thrust her hand into Lillian’s tailhole.
After some shuffling, bruised knees, and whining bellows from Lillian, Sarah had her panties below her knees. They peeled away to reveal a mostly transformed mare vag of mottled black and pink. Her clit winked just as Lillian’s did, and it wasn’t hard to see why her girlfriend had been driven into a stupor by the sensations that screamed from their shifting genitals. Had Sarah transformed while they were riding, those over-sensitive lips and that puffy clit grinding into the saddle, she would be just as much of a gibbering mess as her lover. Even now it was hard for her to think straight particularly with Lillian’s tail curling up and slapping her in the side of the head every few seconds. To say nothing of her heated crotch nearly pressed up against Sarah's face.
Her attention was drawn back to Lillian as she noticed her love was squirming. Lillian’s tail was flagging incessantly, and her breaths were coming in sharp gasps. She had her hand on her stomach, pressing and sliding her palm down. Sarah starred puzzled at the motion. It became clear when her hand that was still lodged inside Lillian’s donut felt two orbs slide to the bottom of her pelvic floor.
The horsecock that dangled between Lilliy’s legs was now a foot long, pink-capped brown monster. It’s tip flared in a pearly ridge dribbling pre onto the dirt path below. At the base of the new cock was a deflated sac of skin. It wouldn’t be deflated for long.
Lillian pushed.
Sarah just managed to free her hand before it was clamped down on by the vice of Lillian’s abdominals. Lillian screamed twice. The first was because of the sudden removal of Sarah’s hand, and the second was because an egg sized testicle popped into place in her brand new scrotum. Her horsecock immediately grew ridged and slapped it’s length across Lillian’s belly, a gush of cum erupting from it’s tip.
She trembled on the ground in front of Sarah who sat there fluttered and dazed. Her cheeks were on fire as she saw her love cum on the ground, and her heart pounded in her ears. As well as elsewhere…
Sarah looked down, and honestly, the sight of her clit standing at far too much attention didn’t even surprise her. It pulsed larger with each beat following the same path as Lillian’s had before it. Her tiny cock was mottled the same black and pink as her vagina. Her finger ran across the tip of it causing her to buck at the air. She came right then and there. Her horse bits left a puddle on the ground, and her cock began to gush, not leak, gush pre. She stared at the cock then back up at Lillian who was still grunting trying to force out her remaining ball.
Sarah shuffled up to Lillian in a trance as if she was being lead by her new prick. It was where it belonged, naturally. Of course it would lead her there. Her hands took Lillian by the hips. The last logical bit of Sarah’s mind noted that her love’s rear end was now covered in a dappled white and red patterning of fur. Her fingers dug into the beautiful fur, and then she buried herself inside Lillian.
Lillian didn’t scream this time. She whinnied. A full-on horse whinny that rattled Sarah’s eardrums though she lacked the ability to care. Her love’s folds were shockingly tight as strong muscles squeezed Sarah’s prick. With each slap of her hips against Lillian’s thighs she was squeezed even harder.
No, that wasn’t right. Lillian wasn't squeezing more. There was simply more of Sarah’s cock to squeeze. It grew as she fucked her mare. It grew until she could only sink herself inside of Lillian up to her medial ring. It grew until it’s sheer girth was enough to help push Lillian’s other testicle into its final resting place, her balls looking like a pair of navel oranges in a brown leather bag.
Lillian came again, fully this time. A fountain of white spunk coated her chest and chin. She continued to gush more and more ropes as Sarah pounded away at her.
Only a growing heat and pinching in her belly slowed Sarah down. She grit her teeth, nostrils flaring as she forced herself to press on and breed her mare. Lillian may have grown her cock first, but Sarah had beat her to using one. She’d give her love her turn, eventually, but for now… She. Was. HERS!
A primal part of Sarah knew what the descending feeling in her stomach signified. Knew that when they hit bottom it would be her limit.
She welcomed it.
The release barreled down on her like a train she had every intention of catching. The weights in her belly hit bottom and she PUSHED!
She felt her balls fall into place as they immediately slapped into Lillian's on her next and final thrust. It was too much.
She exploded into Lillian. It was enough that seed filled her love and gushed back out around Sarah’s cock.
Lillian collapsed into the puddle of her and Sarah’s own making. Her large rear-end, now more horse than human, listed sideways dragging Sarah along with it. Sarah’s cock slipped free of it’s warm confines releasing a stream of cum trapped within. It pooled about their waists as Sarah came to a rest beside Lillian.
Sarah felt a moment of clarity wash over her as she lay by her love. She was acutely aware of what she’d just done. Of what they’d just done. She could feel the cool air on her prick as it retreated into it’s sheath. The air was perfumed with the smell of sex and horses. Apache and Nuggets lay nuzzling each other several dozen feet away, so she doubted it was them she could smell. Her rear felt overly crowded, no doubt she had a silver dollar sized donut just as Lillian had, and the odd weight of her nut-sack, which hung awkwardly and heavily off to one side, just did not feel natural.
And yet she could not find enough of a reason to care about that. At least not for right now. Before she slipped into unconsciousness, she reached forward and grabbed Lillian’s tail. She draped the silky hair down her leg like a thin blanket as she spooned up against her girlfriend’s back. She relaxed content to let the past few minutes be a strange, wonderful fever dream. They could let reality hit them in it’s own time.