"Are you fucking crazy? " screamed Brittany. "That dick looks like it is two feet long, and just as thick. There's no way he could fit inside me."
"Yeah, how is that going to work? " asked Leslie. She really excited about the idea. She wondered if cumming inside Cindy's pussy would make her even larger and stronger than the both of them. The thought of watching Cindy outgrow them almost made her cum herself. But now that Cindy mentioned it, Brit's plan didn't seem to make sense. "Don't get me wrong - I love the idea. But I think she might be right."
Brittany smiled, and walked over to Jeff's semiconscious body. She grabbed the jar she had brought with her to hold the rag with the mare's scent, and waved it beneath Jeff's face. Jeff groaned, but did not wake, as his cock slowly began to stiffen for a third time. His erection became rock hard, and a little precum dripped from its tip. She quickly scooped it up in the jar, and walked back to Cindy and Les.
"Like I said, this is an experiment. I want to try something, a little idea I had. Now hold her down, " said Brittany.
Les pulled Cindy to the ground, with Cindy struggling all the way, and continued to hold her hands behind her back. Brittany pulled down Cindy' skirt and panties, revealing her nude shaved pussy. "Now, lets' see what this does, " said Brittany, as she scooped up the precum in her hand, and began to rub it around Cindy's slit. She rubbed it on Cindy's clit, then deep inside her vagina, as far as her fingers could reach.
Cindy's pussy suddenly felt very warm, and aroused. As Brittany rubbed, she bit back a moan, but her toes curled, and she felt her nipples stiffen. Brittany saw her reaction, and began to slow her strokes, running her fingers over her pussy more slowly, barely touching Cindy' sensitive skin. Brittany removed her fingers, and was not surprised to see that they were dry, like all of the semen had been absorbed. The pleasure was almost unbearable, and now that Brittany had stopped her massage, Cindy ached for someone to touch her pussy. She bucked in Leslie's grasp, and surprised both the other girls when she broke free.
But rather than run, Cindy just stayed on the ground, and kept rubbing and kneading her pussy. Les and Brittany watched in fascination, as the lips of her pussy began to get darker, larger, and thicker, as it grew and stretched in size. Finally, Cindy could stand it no more, and had a massive orgasm, releasing a large amount of vaginal juices.
Cindy looked down at her pussy, and saw that it had changed but she no longer cared. Despite her orgasm, she was still incredibly horny, and her desire overwhelmed the rational side of her brain. All she could think of was how excited she was, and how she needed something bigger to fill her hole and finally satisfy her. She looked around the room for something, anything. Leslie and Brittany just watched, fascinated by the change in her, and slowly pointed to the corner of the room, where Jeff lay unconscious but erect on the floor.
Without a word Cindy ran over to Jeff, and let his large dick impale her now equally large pussy. Even with her increased size, it was still a tight fit and took some time for her to work it all in....well, at least as much of it as she could fit in. She began to ride him in the cowgirl position, pumping his shaft up and down inside of her.
Jeff slowly woke, and saw the girl of his dreams, straddling him. He was confused at how she able to handle his large dick, but her tight vaginal muscles felt so good against his throbbing dick that he didn't care. As she continued to ride him, timing the tensing of her vaginal muscles with her pumping, Jeff reached up to touch the magnificent DD breasts he had fantasized about for so long, and began to gently massage them. He felt them growing within his hands, getting softer as bright yellow fur started to grow across her breasts. Finally, Jeff could contain his seed no more, and released his semen in a massive orgasm. Cindy came, too, rocking in his lap as she clenched her fists and curled her toes in ecstasy. After it was over, they stared at each other for while, winded and tired but satisfied.
They were interrupted from their postcoital bliss by the sound of laughter and clapping.
"Bravo, bravo, " said Brittany with a wicked smile. "That was some high class porno shit there. This worked out better than I could have ever hoped for."
Cindy looked down at Jeff, and began to realize the implication of what she had just done. She was frightened by what might happen to her. She jumped up off Jeff, with his cock coming out of her cunt with a large wet pop, grabbed her skirt and ran out the door of the locker room.
Leslie was disappointed. She had wanted to watch her change, and was curious to see the final result. She looked to Brittany for orders, as always.
"Well don't just stand there, you idiot. Go get her! " yelled Brittany. Les ran to the door, and opened it, and took off down the hallway after Cindy. Brittany ran after her, but stopped at the door and turned back to look at Jeff, drained and exhausted on the floor.
"And you, " she said staring directly at Jeff. "You don't go anywhere. I want you to wait right here for us to get back. I have plans for you and that wonderful cock." Then she took off down the hallway after Cindy.
Jeff just lay back on the floor, more tired than he had ever felt in his life, and fell asleep on the floor.