She ran into the field and thought,"horses... I need a horse!" before running to the stables. Mary ran in, and saw only 3 horses in the stable, 2 mares and a stallion. Mary could feel her cock growing as it slid down her pant leg and so she decided that she should take off her clothes before they were ruined in what was to come. She frantically slid her pants and panties down, then took off her top and undid her bra. Now naked, she could get down to business. She picked a mare, and her enormous cock was throbbing with the need to fuck. Her lust was growing and growing. She ran over to the mare, found a nearby box to stand on, which she pulled over behind the mare, and luckily for her, the curse would make any female horse also in the mood for sex. She grabbed her cock and thrusted it into the mare's vagina. She started to fuck as hard as she could and then she decided to put her own hands to work by shoving one arm as far as she could into her own equine vagina and one as far as she could into her equine ass. This was much better and her body was compulsively thrusting as hard as she could as fast as she could, the mare squirted, and then, a massive ejaculation. Mary came deep in the mare, and her girlcum was shooting out of her equine vagina and flowing down her balls and legs. Mary's testicles completely emptied into the mare, and now she needed a few minutes to recover.
However, the curse worked on all females, including the mare that Mary had just fucked. The mare's vulva and asshole puffed out and expanded even more than they were, then, with a whinny of surprise, the mare started to grow a horsecock as well. Mary noticed this when the horse started to neigh with the massive libido it now had. Mary's lust took hold of her when she saw it, and she immediately went over to the cock and sat with her face on the ground and her ass up towards the cock. The mare's testicles then dropped, growing and filling with cum to the size of grapefruits. Once the cock had reached a length of about 3 feet, Mary knew the horse was about to have a huge ejaculation, and decided she wanted to be filled with cum, and she moved the mare's cock into her ass. However, the cock kept growing and growing, pushing its way through Mary. Mary could feel the big hot cock as it expanded into her and felt it push her organs around to fit its immense size. Mary started to finger her wet pussy but decided that if she was going to have a massive cock in her ass she should have one in her vagina, and then moved her own cock into her vagina. Mary then got very concerned as the cock kept growing in width, eventually becoming 1 foot wide. She felt the cock moving up her throat and then it pushed its way through and out of her mouth. She was kebabed on the mare's cock, and as it got harder, she felt herself being pulled off of the ground, being hoisted up by the cock. The mare's cock finally stopped growing at about 6 feet long, with testicles the size of beach balls, and then the mare was ready for its massive ejaculation. Mary could feel her horse ass being stretched, so she decided she needed to get off it, and frantically grabbed at the ground trying to get released from the cock. She pulled it through back down her throat and felt it retreating as she moved forward. The mare was just waiting for a slight feeling before her cock exploded, but was suffering from the biggest blue balls ever. Mary got the cock out of her ass, removed her cock that she had in her vagina and placed it into her mouth, then shoved the mare's cock in her vagina as deep as she could. The mare started fucking Mary with all of her strength, shoving the horsecock deep into Mary, and then the mare came. It was incredible, she could feel the hot cum rocketing into her and she felt herself cum into her mouth and felt the mix of her girlcum and the mare's hot steamy cum shooting into and out of her pussy as the mare's cum inflated her. After 3 minutes of pure sexual euphoria, the mare lost interest with Mary and walked over to the other mare in the stable and started fucking it. Mary was broken, she had cum so hard that her balls were completely empty and then she had an idea.