This is Camilla's gift to me: a helpless Fiona to do whatever I want with. I saddle up, making sure to dig the heels of my riding boots into her sides. She winces so I pull her head up with the reins, giving her hair a sharp tug too.
"You're my little pony now, Fiona," I tell her. Camilla's getting comfortable on Ashley, stroking her ears and the back of her neck and with the other hand, her curvy little bum, drawing her long, slender fingers over Ashley's exposed pussy. I drag Fiona's head round with the reins, making her watch. "Looks like you're not doing a very good job of looking after Ashley, are you Fiona?" I whisper in her ear, bringing the riding crop down smartly on her bum a couple of times.
"I think," says Camilla "that we should race our new ponies. Three laps of the stables. We'll have a treat for the winner and a punishment for the loser."
We line Fiona and Ashley up at the back of the stables.
"On your marks," calls Camilla. "Get set. Go!" It feels weird, Fiona squirming and jiggling underneath my saddle but I'm determined to enjoy humiliating her. Fiona should win easily: Ashley's tiny, Camilla can barely keep her long legs off the ground, even draped over her shoulders but of course, there's no way we're letting Fiona win.
I drag my feet along the floor, slowing us down, dragging Fiona's head uncomfortably to one side whenever it looks like she might pull ahead. All the while, of course, I'm chastising her for not going faster and beating her with the riding crop, making a mass of bright pink marks on the pale flesh of her buttocks. It's the perfect set-up for the punishment we have planned for her. Plus this way, I get to see Camilla's perfect bottom bouncing atop Ashley's jiggling, fleshy buttocks and glistening, wet little pussy.
We thrash Fiona and Ashley across the finish line, sweating and gasping for breath. Fiona makes a last desperate attempt to pass Ashley before collapsing exhausted, tears starting to trickle down her cheeks.
"On your hands and knees, pony!" I shout at her, bringing the riding crop down as hard as I can across her buttocks.
"Well done Ashley, you clever little pony," Camilla purrs, stroking Ashley's neck and hair. Camilla feeds Ashley a sugar lump, laced with more Viagra.
Camilla turns round so she's riding Ashley backwards. We back Ashley up to Fiona's face, pulling her head back with the reins so she's forced to stare into Ashley's bum, the sweat glistening on her buttocks and thighs.
Camilla reaches down and begins to lightly finger Ashley's pussy which is by now soaked with her juices and sweat. Ashley lets out a little gasp as does Fiona. I jerk Fiona's head back once more and dismount to the side so I can start spanking her with my hand this time, firmly and controlled, hard enough to sting, building up, swapping sides on her buttocks every three or four blows, turning them a nice pale pink while keeping her head in position with the reins in my left hand.
Camilla's caressing Ashley's erect clit with her middle finger, slipping the index in and out of Ashley's wet little pussy while she stares, smirking, into Fiona's face. Occasionally she pulls her finger out to wipe some juices on Fiona's face or make her suck on it. Ashley is moaning softly, an incoherent series of noises through the bit in her mouth. Camilla gently fingers her asshole with her left index finger while keeping her right hand going on her pussy and Ashley starts whimpering, backing her bum onto Camilla's hand. I keep spanking Fiona, whispering in her ear what a dirty little pony she is and that she belongs to us now.
"Look what we're doing to your little friend," I tell her. "You were meant to look after her and now we're turning her into a dirty little slut! What would Miss Grayling say if she could see you now?"
Camilla brings Ashley near to a climax, then pulls her hand away. Ashley's moans are high and urgent, her buttocks trembling as she tries to beg through the bit for Camilla to finish her off, "Peee...peee...Iya...peee!"
I pull Fiona's head round to face me and look into her eyes.
"I'm going to take the bit out now, Fiona. If you try to scream or shout for help, no-one will hear you but your punishment will get a whole lot worse. Do you understand?" Fiona meekly nods and I unfasten the bit, letting it hang loose at the side of her mouth. She gasps for breath and she drools a load of spit down her chin but she doesn't try to shout. "Come here Fiona," I say, holding her nose and pulling her forward.