Jen's mom pulled into the driveway shortly after Jen got on the bus to school. She rushed inside in her mom jeans and blouse which barely held in her FF tits. She swung her long brown hair over her shoulder as she sniffed. Something smelled strange, musky. She couldn't dwell on it as she was going to be late to meet with her friends. She searched the kitchen, no phone. The living room, no phone. It must still be in her bedroom charging. Hurrying upstairs she noticed the smell getting stronger, but still was more focused on the phone. As she touched to knob to open her door, she felt something slimy on the knob and pulled back "Eww, what the fuck?" She flicked it off her hand. It was some white-ish goop. Probably Jen not washing her hands after using product again. She grabbed her phone and stuffed it in her purse when she stopped and nearly doubled over.
Her crotch had suddenly become so hot, so wet that she could feel her panties already soaking through. She touched her crotch through her jeans and fell back on the bed with a moan. Checking her hand she could see a little bit of moisture. Her ass also felt hot. A pressure built in her groin as the changes took hold. She was scared beyond believe but also more aroused than she had ever been. Groaning as her brand new cock and balls grew in, she gave a small yelp when they burst through the fabric. Then she screamed when she saw her massive horse cock rising above her, extending to a full 2.5ft. Jen's mom lifted herself up on her elbows to see more, spying the coconut sized testes resting between her legs, begging for release. Her fear dissipated as her arousal continued to grow, and she began to slowly, experientially stroke her cock. It wasn't long before she had both hands pumping to the twitching rhythm of both her cock and her quivering new horse pussy, with her mouth sucking on as much of the tip as she could manage.
Soon after, her legs tensed and bucked, her cock pushing more towards her face as she started to cum. She fell onto her back, her cock being pulled away from her mouth once she was no longer sitting upright, getting a mouth and face full of horse cum.Her pussy exploded as well, soaking the bottom of her balls, her bed, and her ruined jeans.The spent cock flopped onto her cum soaked shirt as she wiped it from her face and hair. Her chest heaved as she wondered what caused this and the best orgasm she'd ever had, when she realized "Fuck!" she shouted, and jumped up. Quickly removing her shirt and ruined clothes, she hopped into the shower to clean herself and maybe only be a few minutes late. In the shower though, her cock demanded attention again, almost like another person in the stall. Sinking down to sit, she took the shower head with her. She tucked it under her balls and cried out in pleasure as the streams of water splashed and tickled her horse cunt. Feverishly she stroked her cock until it was its own shower, raining down globs of cum on her. She came twice in a short span, leaving a thick layer of surprisingly tasty baby batter all over her. Caught up in her lust, she used it as shampoo and body wash, rubbing it over her spent cock and cunt, licking it off her fingers as she was done.
Once out of the shower she stepped around the puddles of cum that coated her room, looking back at the shower and the cum cloaked drain. She slipped into some loose fitting sweatpants and a loose shirt as well. Her tits had been aching too. She could feel her cock sitting in her pant leg, already close to begging for more attention. Her phone buzzed, letting her phone she had 2 new messages. One, from a few minutes ago, and another now from Susie. 'Mary, since you're running late we're starting without you. You'll have to miss the walk there and just meet us for lunch and shopping, mkay?' It didn't really phase Mary. She replied 'Ok, I'm cumming now, Ill meet you there'. She stroked her cock idly at the pun before grabbing her purse and heading off,