Melissa stood trembling as her horse cock and balls continued to expand. Each pulsation of the flesh pushed her member bigger, longer, and thicker. It was now so huge that the plump flattened cock tip hovered just below her chin, while her darkened black balls were now the size of round heavy fruit.
I simply stared at my freakish handiwork as Melissa stood helplessly and continued to grow.
“J-Joey...” She said nervously. “Why would you do this to me? This is... a little too freaky.” She grabbed her massive member and held it out of her face as it continued to grow, nearing the end as it strained and thickened even more.
“Oh, I don’t know...” I grinned, knowing that soon she’d completely be a dual sexed horse. It seemed pointless to even comfort her. Oh well, I stood up naked with a hard dick as Melissa stared in shock.
“Y-You like this?” She gaped. Her equine member suddenly jolted as it grew to full size, almost a foot over the poor girl’s head and thicker than my arm. It was a truly inhumanly massive prick, to say nothing of her giant churning balls.
I approached her carefully and took her cock in both hands. She gasped as I pulled its stiff length down to a more relaxed position and stepped back, placing the enormous length between us. It throbbed excitedly at the touch. Melissa threw her head back and gasped.
“There, see?” I consoled. “Let’s go sit down and relax.”
“U-U-Uh...” She stammered. I gave the sensitive flesh under her tip a little caress and she nearly collapsed from going weak at the knees. “O-Okay...” She whispered, almost panting.
I lead the girl by her huge horse dick and carefully sat her down in front of her couch. She draped her arms over the cushions as I sat down next to her. The horse dick was so warm, so huge, so hard. I gave it a gentle stroke from massive base to enormous apple sized flare. Melissa moaned and writhed. The pleasure was withering.
“It’s... it’s so... good.” She gasped.
I checked between her legs and remembered the next part of her transformation. I couldn’t see anything, her balls were obscuring everything. Happily, I lifted one massive orb, as big as a grapefruit, and went wide eyed as I saw her pussy lips behind her balls puffing up and turning thick and black. Inside, her clit was back, expanding, and her passage was growing bigger. I carefully dropped her huge nut down and she jolted again.
“A-Ah!” Melissa gasped.
“Here...” I grinned evilly. “Let’s give this big guy some love.” She had no idea that soon she’d be my pet horse.