Megan, Jen's younger sister in junior high, had heard rumors about the bizarre day at the high school, but she didn't believe them for a second. Until she came home and found her mother and sister locked in each other's arms. Sweaty, the smell of sex in the air, and to Megan's shock, both with massive erections between their legs.
"What the fuck?" she said. Unbeknownst to her, her hand grazed the top of the couch as she took a step back. She tried to shake the globs of cum off, but it was too late and her body had already started. changing.
All the heat in her body centered on her crotch, which had suddenly become wet. She dropped her backpack to see what was going on. She removed her pants, only to find that her soaking underwear was starting to tent out in front of her. The pressure building in her crotch spread to her ass, and then it all but exploded. She moaned, having never felt such incredibly strong lust before, and reached a shaky hand down.
Jen and Mary were too absorbed in their own pleasure to notice Megan at first. Until they sniffed the air and caught the scent of a new horse. They turned to see Megan stroking her growing appendage, naked from the waste down. She was completely lost in the bliss, unaware that she was masturbating in front of her mother and sister. The cock slowly extended to its full length, a little over 2 ft, and a pair of grapefruit sized ball dropped down. Megan's hands slipped down to cup them, and she realized she still had her woman parts, though they were now a horse's.
"Oh my goddddd." she moaned as she slipped her hand into her new folds. It didn't take long for her to reach her first male orgasm, and even quicker for her to notice Jen and Mary watching her.