"Are you sure this looks ok", asked Kate nervously, "the jodhpurs are so tight that I couldn't get knickers on underneath."
"You look fine," giggled her friend, Felicity. "I just want you to meet everyone. You are going to love horse riding.
"I don't know, Felicity, you can see every fold of my pussy. And I'm sure I should be wearing a bra under this white blouse."
"You look perfect, like you were born on a horse."
The girls walked into the yard, Felicity stifling more giggles as Kate grew more uneasy and self-conscious. Her embarrassment grew more acute as heads turned and she drew increasing attention from the stable hands and other riders milling around the stables.
"Who is this," bellowed a rotund middle-aged woman in a Barbour waist coat and flat cap she clearly wore regardless of the season, "a friend from university?"
"Yes, Margaret," replied Felicity, "this is Kate from uni. Vic, this is Margaret. She owns the stables"
"Are you a rider, Kate?" asked Margaret.
"No. This will be my first time."
"Really? You have the ass for horse riding" she said, slapping Kate's ass like it was the hind quarters of a prize-winning racehorse. She snorted loudly as she did it.
"Felicity said this pony trek would be the ideal way to start." replied Kate after regaining her composure.
"Indeed, young lady. You will have lots of fun", she reassured Kate.
They made their way across the yard, past the dozen or so other trekkers, toward three beautiful ponies being prepared by a stable hand for their ride. The stable hand had his back to the girls as he positioned the last bridle, but his ass, poured into his own riding britches could not be ignored.
"Kate, this is Greg. He taught me to ride", explained Felicity.
"Nice to meet you, Kate" he said, turning to face the girls.
Kate's eyes, already locked on Greg's ass, remained staring at waist level as he turned, and she was momentarily mesmerized by the impressive bulge that ran down the side of his leg. He clearly noticed her staring, and the realization that she was visibly enthralled by his cock was mortifying for her. It only got worse as her nipples grew erect by her arousal and clearly caught Greg's attention through her thin white blouse.
"Is that supposed to be like that?" asked Kate as she was introduced to her pony.
"You mean its cock?" replied Felicity with a broad smile, pointing at the pony's very visible member. "Sure, that's normal...... for a horse." Causing both girls to laugh.
Kate leaned over and whispered in Felicity's ear, "it's almost as big as Greg's!"
Kate didn't find mounting the horse easy, with Greg having to give her ass a hefty push. Vic was almost sure that he was taking advantage of the situation and doubted that he needed to put his hand so close to her pussy, but she wasn't going to complain.
Greg was riding at the front, and the other trekkers fell in line behind Felicity and Kate as they made their way to the fields beyond the stables.
Two things struck Kate as they trotted through the yard to the bridle paths beyond the gates.
The first was that Felicity had played a prank on her as her unfettered tits bounced wildly even at this gentle pace. She was clearly quite a spectacle as everyone was stopping the activities that had previously engaged them to watch her breasts bounce around uncontrollably instead. Kate couldn't help but feel more aroused as the attention on her grew, with people openly smiling and one young woman even pointing at them as she passed. The disapproving glare of Margaret as they left the yard was further mortifying and arousing in equal measure.
The second thing that struck her was how her already sensitive vulva and clit felt as her hips lifted off the horse and then slammed back down on the saddle with each step. She had been on the horse for less than 50 meters but already knew she was making a mess of the inside of her borrowed britches.
The jodhpurs really were too tight and creaked with every movement now she sat akimbo the horse and every stitch was stretched to its limit. The inevitable happened and Kate's humiliation was intensified as the seam running down the back of her jodhpurs split along the entire length of her butt crack, opening widely as it did.
The rider behind burst into laughter and continued to giggle for at least a minute until he decided to move past Kate and let the next rider get a good luck at Vic's exposed ass. One by one, each of the other twelve riders, some snapping images with their phones, passed Vic and enjoyed the view.
Exposed and humiliated, Vic lost focus on the riding and became rather more interested in the sensations being sent through her groin as the pace increased. She resisted climaxing, but she knew she could have had she wanted. Edging and releasing was building the intensity nicely until she lost all focus and slipped out of her stirrups and fell to the floor, drenching herself as she landed in a large muddy puddle.
Victoria sat on the floor, at the feet of her pony, with mud squelching between her exposed buttocks.