She stopped again and said she wanted the horse to fuck her. I told her she couldn't get under either of these large animals safely, but I would try to come up with a scheme to make it possible and safe for another day. Satisfied with that for now, she took him back in her mouth and worked his shaft-now, at least 12 inches long-until he began to come in torrents. Her mouth was flooded at once and she was forced to release him to come all over her face, neck and breasts. His cum overflowed her mouth and dripped down her chin as she swallowed what she could and gasped for air. The stallion came for at least twenty seconds and at one point, his rear legs seemed to buckle slightly and I started to pull her clear, but he regained his footing and she continued to bathe in the horse's hot semen. When he was finally done, she released her grasp on his receding member and walked out to lie in the warm sun, still drenched in his seed. I followed her with the camera and recorded as her hands roamed through the sperm covering her lovely body. I thought about how tiny her body looked beside this massive beast and was convinced she would never be able to handle an organ of that size in her tight vagina.
Two days later, we returned to the farm at about eight in the morning, after John had gone out to the fields. I rigged a strong sling under the pony that would support his weight and found a long crate that was just the right height for Donna to lie beneath the pony on several blankets we had brought along. With her “bed” prepared, Donna began preparing the pony with her now expert hands and mouth. When she felt he was ready, she crawled under him and positioned herself on the crate. His cock was resting on her belly as she stroked it and slid further up the crate to position the tip between her soaked lips. She seemed in a rush to get the pony inside her and I had to caution her to slow down and take her time. I told her not to take any more than she was absolutely sure she could handle as I didn't want to have to rush her to an emergency room and explain what had happened. That thought seemed to sober her up a bit and she slowed down. She slipped the pony's cock up and down the gap in her lips a few times and positioned it for entrance. She held it there for a few seconds, then started working her way a little at a time toward the bottom of the crate. There was a little resistance before the head entered her about an inch and I could tell by the tightness of her facial muscles that she was already stretching as far as she ever had.
The pony started getting restless, wanting to thrust into Donna and I stroked his back and flanks to calm him down. She had worked two or three inches in and her face had relaxed a little as her muscles learned to accommodate this huge intrusion. She continued to stroke the shaft as she moved down to take a little more and, suddenly, the pony pushed forward another two inches in a single thrust. Donna groaned loudly and I was concerned that she had been hurt but it was soon apparent that the groan was of pleasure at being so filled and she started rocking her hips to lessen the depth of the pony's thrusts while allowing his penetration to deepen only slightly each time. Gradually, she worked most of the animal's length into her depths and let him start fucking her at his own pace. She said he was really hitting bottom and stayed far enough up the crate so that the sling prevented him from going any deeper.
She was moaning and calling out from the fullness of her vagina when the pony suddenly let go. With her pussy completely full of pony cock, there was no place for his cum to go but out and it squeezed between his penis and the walls of her vagina and started pouring fourth onto the blanket under her. Donna started coming and the lower part of her body thrashed beneath the pounding of her four legged lover. With her hands, she scooped up some of the semen gushing from her body and covered her face with it, getting as much as she could into her mouth. I backed the pony up a little and helped her crawl out from under him. She lay on the straw of the stable and breathed deeply as I watched the lips of her vagina slowly close to cover the gaping cavern soaked in cum.
When she had recovered, I took her into the house to shower and dress.
Riding back from the farm, she said she had never felt so full in her life, but she still wanted to try the stallion. I reminded her of the difficulty of working with such a large and spirited animal and told her I really didn't like the idea. That night, we made love on her large bed and I was surprised to find that her vagina had returned almost to its original tightness. My entry was a little easier than usual but the friction was still much tighter than any other woman I had ever been with. She said that I still felt the same and that she still preferred my cock to any animal but that the feeling of being filled was completely different. She insisted that we try the same sling and crate arrangement with the horse and I made her promise that she would stop if she experienced any real pain. She assured me she would know if it wasn't going to work and reminded me that even a horse cock is smaller than a baby.
A few days later, we were back at the farm just as John was finishing his lunch and preparing to go back out to do some plowing. He asked how our research was going and Donna told him we were learning new things almost every trip, giving me a small smile as she said it. As John mounted his tractor, he turned and said, “Better watch out around that pony. He's been acting kind of frisky the last couple of days. I think they're getting him out to stud none too early.” We assured him we would be careful and waved as he drove off.
It took a little time to rig the sling under the stallion and I added a couple of ropes leading back to large posts behind the horse so his forward movement would be strictly limited. While I was rigging the sling and finding a higher crate, Donna was enjoying two of the dogs. She was on her hands and knees as the Lab pumped deep into her rear passage and a big Collie was on his back before her as she sucked and licked him to orgasm. When everything was ready, she lay down on the blankets with her face along side the stallion's cock and stroked and licked him to full erection as I ran the video camera. She smiled at the camera and kept saying how nice the horse's cock felt and tasted and how badly she wanted him to fuck her. She was putting on a real show for this tape and wanted to be the ultimate slut. She took more of the horse in her small mouth than I would have thought possible and talked about how she'd love to have him come in her mouth if she didn't have other plans.
By the time Donna turned around and put the huge head against the swollen lips of her pussy, the horse was at least sixteen inches long and two and a half inches around. I put down the camera and applied an entire tube of K-Y jelly to the organ and the waiting vagina it would try to invade. Donna had the tip inside her almost immediately and pumped the shaft with her hands to ease a little of the massive member between her already stretched lips. There was an intense look of concentration on her face and I knew she had made up her mind she was going to make this work, somehow. The horse was dancing around in agitation and obviously wanted to get on with the business at hand, so I petted and soothed him as best I could and she slowly worked a little more into her tiny body. By this time, the lower portion of Donna's belly was already beginning to bulge out slightly from the mass of firm flesh within and I could see her progress directly as the bulge moved ever so slowly up her stomach. She took about twelve inches before she groaned out that he had hit bottom and was pressed firmly against her cervix. I could clearly see the entire length outlined on her belly as she released her grip and let the horse set his own pace. I couldn't believe what I was seeing. This beautiful, petit blonde was being fucked completely by a full grown stallion and loving every inch of it. Her head thrashed from side to side as he repeatedly flicked his hips and strained against the ropes of the sling wanting to release his seed deep into this strange mare.