For some reason, Anna felt herself getting very aroused staring at herself in the mirror. She looked at the clock. She had some time before her boyfriend came over. She might as well enjoy herself.
She sat down on the bed, and began to finger herself. It was a little difficult. She had to move the tail out from under her butt to sit comfortably. The costume had strange gloves with three fingers ending in a thick black nail. Her pussy was accessible, but she had to work her way past the large thick rubber vaginal lips of her fake horse vagina. But she felt so horny that she didn't care. And when she finally reached down into her cunt, she was rewarded with waves of pleasure as she repeatedly thrust her fingers inside and out.
She felt so good she didn't notice the changes in her body. She didn't feel her body stretching larger to fill the gaps in the costume. She didn't feel her thighs growing thicker and more muscular, as her calves became thinner and longer. Her feet stretched to fill the long hooves, and her toes merged. Her waist and chest stretched wider, pushing against the confines of the costume. He breast swelled to fill the D cups. Her biceps bulged to fill the large sleeves. Her neck stretched, and her jaw grew longer to fill the muzzle. Her ears grew longer, and slowly moved up her head. She barley felt the slight tickle as the costume merged with her skin and the roots of her fur coat extend below the dermis of her skin. She whinnied in pleasure, as she finally came. She was shocked out of her pleasure when she felt her tail slapping her thigh. She removed her thick fingers, and the vaginal lips of the horse costume were strangely sensitive.
She stood up, a little unsteady standing on her new hooves. She reached behind herself, and grabbed her tail. She pulled and felt pain at the base of her spine.
Okay, that was fun, but this is too weird. I need to get out of the thing, thought Anna.
She reached behind her back, but could not feel a zipper. She began to panic. She stomped over to her mirror. Maybe if she could see the zipper, she could get a grip on it. She looked at the door, and saw that she was taller in the costume, over 7 feet. She was shocked by her appearance. Her tail wagged behind her, with a mind of its own. Her ears twitched. She ran her tongue along her lips, and felt moist saliva. She reached up to touch the mask. Her hands were surprisingly sensitive beneath the gloves, and her snout felt warm beneath her hands. This was no rubber mask. This was her face!
Her fears were interrupted by the sound of her door opening. She looked at the clock. She was amazed by how much time had passed. It must be her boyfriend, entering their apartment. But she couldn't let him see her like this! What could she do?