Mary ran out into the cool night air, stripping her nightgown off. The grass tickled her bare feet as she stood on the lawn between the house and the barn, wondering what the random change would transform her into? Her breasts heaved with her excited breaths while her rounded stomach gleamed in the moon's light. She caressed her pregnant human belly for hopefully the last time, knowing that she was giving her baby a better, more carefree life away from that cheating bastard.
As she calmed, opening herself up to the change, Mary felt her breasts begin to ache in a strange way. Pregnancy had brought a lot of new aches and pains, as well as normal human changes to her once lithe body, but this felt ...different. Her bra straps began to feel tight, so she quickly removed it as well as her panties, standing naked on the lawn beneath the moon. She gently cupped her breasts, feeling their weight and warmth and a new... sloshiness? Her breast milk hadn't come in yet, but she knew it was could happen months before your due date... She tugged on her nipples, surprised when twin jets squirted into the night! "Oh wow." she breathed, amazed once again at the evolution and capabilities of the female body. Repeating the action, she soon noticed that the milk gave off a sweet, sort-of earthy smell, and her nose twitched as she craned her neck down to get a better whiff. Were her nipples... longer? They were! And her boobs had definitely swelled - they almost seemed to have pushed out and joined at the middle a bit, almost like an animal's udder! Mary jolted, wondering what sort of creature she was slowly becoming?!
As she continued to support her changing mammaries, she felt her arms being pushed lower, not from a further increase in weight, but she realized that her breasts were migrating downwards. Her chest was flattening as her long nipples and milk-filled bag slid over her swollen belly and came to rest just above her crotch. She now definitely had an udder, and she realized she would soon be nursing her baby from all-fours!
A cramping sensation in her hands grabbed her attention, and as she released her udder and raised them in front of her face, she saw that her middle fingers seemed wider, or maybe connected? and much too long... her palm seemed stretched and her thumb, pointer and pinky fingers were shrunken compared to the two center digits. Something black was encasing the tips of those fingers, forming into... Oh! She had cloven hooves in place of her hands! Her arms were now much thinner and longer, and she reached out to lower them to the ground, finding that they almost matched her legs in length! She felt them dig into the soft, damp ground as another cramp gripped her feet, her toes following the same path of transformation until she was standing on four hooves, her spine parallel to the ground.
Something tickled above her buttocks, and Mary craned her neck to look over her shoulder. She could just see a bit of fluff pushing out from the base of her spine, growing into a spade-shaped tail, brown fur spreading outward from where it had sprouted. The fur rapidly covered her hips, flowing down her legs and over her distended belly. As it reached her shoulders and started down her forelegs, Mary felt her neck streeetching, muscle developing to support her lengthening spine. Fur followed, Mary's hair-tie falling to the ground as her human hair was replaced with short brown fur.
Her ears twitched, suddenly appearing in her peripheral vision as they grew, pushing outward from the sides of her head into two large, pointed appendages, surprisingly controllable and extremely sensitive! Something rustled in the woods at the edge of her property, and Mary's ears instinctively focused on the sound, her head coming up with alertness. Her spinal column had shifted, reorienting to exit from the back of her skull, allowing her to look forward while standing on four legs. As Mary's attention was fixed on the trees, Her nostrils flared, straining for a scent of the unseen creature. Her nose broadened and darkened, her mouth pushing forward as her face elongated and her eyes enlarged, spreading to the sides of her head and giving her a wider range of sight. Long lashes framed them as her irises darkened from blue to brown and her pupils shifted from round to a horizontal oval.
The world around her suddenly appeared much brighter, her nightvision enhanced as the changes finished up. Another *snap* sounded from the treeline, and as Mary stood frozen in the yard a large buck stepped from the woods, nostrils quivering as he caught the scent of the pregnant doe. He lifted his large rack of antlers and grunted, causing Mary to instinctively step towards him.
The Yiffr app had done it's work, and Mary lightly trotted across the grass, following her new mate into the forest and leaving her human troubles and cheating husband behind for a wild, carefree life.