“Kinky,” Jason chuckled, but he understood her plan.
The horse opened her mouth, held out her tongue, and Jason reluctantly spat out a trail onto her tongue. The animal’s eyes widened at the telltale tingle the moment the spit touched her tastebuds and she swallowed eagerly.
They waited patiently, and the mare let out a little gasp that soon turned to disappointment.
“I felt something,” she admitted. “But it stopped faster than it started.”
“So my jizz creates a stronger reaction.”
The horse glanced down excitedly. “And that means my saliva can progress you in return, doesn’t it? C-can I lick somewhere?”
Jason gasped, heat rising in his body instantly at her suggestion. His tip slipped from his sheath in response.
“Oh!” The mare stared. “Yes, I can lick that.”
“It’s already equine.” Jason blushed. “I can hide my crotch better than my ears.”
“Okay!” The horse nodded, stepping forward awkwardly on her modified hoof hands. “Let’s do this!”
Jason leaned back gently and continued to grow erect as his larger horse cock gradually inflated. They both gasped as it reached its full new excited size… nearly 18” long and as thick as a pop can at the base of the sheath before it tapered off to a distinctly horse shaped crown.
“That’s… that’s getting closer to something I can enjoy!” The mare said with lust. “You sure you want just my mouth?”
“For now, this is safer. I don’t want to have to explain all this to Taylor.”
“Okay. I’ll control myself.”
The mare opened her mouth and began to gently lap at the tip of Jason’s huge new cock. It began to tingle from base to tip.
“Oh fuck!” Jason’s fingers dug into the plastic of the stool.
The mare licked more, watching in amazement as the head swelled a little bit fuller in size, almost coming to an equine flare. She gingerly went lower, dragging her tongue from the base to tip and coating the shaft and head in her wet saliva.
“Oh! Oh!” Jason winced. “It’s growing again! I can feel it!”
The mare watched in wonder as Jason’s 18” horse member began to swell. It started to gain a uniform thickness as the shaft began to fatten. Once the girth had thickened all the way to the tip, the entire cock began to pulsate.
“Yes! Yes!” The mare encouraged, breathlessly watching as it began to grow, the tip flattening further and flaring, the length stretching. The weight and thickness increasing. The whole shaft pulsed suddenly.
“OHHH!” Jason suddenly winced. “Oh God!”
The mare gasped as rope after rope of thick sweet cum erupted from the down angled urethra, spilling onto her muzzle before she gasped and caught more of the fluid on her mouth, gulping hungrily.
Jason trembled and glanced at the pulsating baseball bat between his legs. “S-shit!”
“More,” the horse said hungrily, and leaned in to begin lapping at his cock, soaking it again in her saliva, which began to drip down the twitching and bucking shaft and toward his balls.
“No! No!” Jason stiffened, back arching. “It’s getting too big for me! It’s so sensitive!”
The mare gasped as it began to swell forward again, the shape becoming even more equine as it grew and grew, putting on a few more inches as it slowly enlarged and thickened to a monstrous size and girth. Better for a horse, enormously massive for a human man.
And the soaking of his balls caused them to start growing too. The horse gasped, leaning in close, and began to lap at Jason’s huge black testicles. They were slowly filling out rounder and tighter, almost the size of naval oranges now.
“Fuck, fuck!” Jason tensed. “Oh God! Bigger! Bigger! Keep licking me bigger!”
The mare didn’t need to be told twice. She wanted him bigger too. She feverishly began lapping and teasing at his cock with her mouth and tongue, wincing as she felt her own transformation from the jizz she had gotten starting to progress.