He refastened her arms and picked up the bridle leaving the bit on the table. The bridle was a sort of skullcap made from a headband and centre strap with two vertical straps that hung from the sides and supported steel rings about the width of her hand in diameter. A chinstrap ran between these and another strap went around the back of the head. This was undone. Lucinda saw the diamond that would go on her forehead. She was touched to see it was tooled with the letter 'P' and the letter 'l'. Peter picked up the bit and showed her how it clipped to the rings with a simple latch for easy release. She noticed the thick rubber sleeve and was thankful how much narrower it was than the horrible ball gag. He slipped the bridle over her head and adjusted the straps until she nodded in comfort. With the brush he'd bought in with the bowl and towel he groomed her hair until it hung over the rear strap. Then he forced her lips apart and slipped the bit between her teeth. It was much easier than the ball gag and she gratefully chewed on the rubber. He attached two 'blinkers' to the vertical straps and she found her peripheral vision considerably reduced. Again more locks held everything in place. He stood back to admire her. 'A few final touches.' He stated. Lucinda's heart missed a beat when he picked up the long blonde tail. 'At last,' she thought. He spread her buttocks with his fingers and fiddled with the plug that made her wince until, with difficulty, she could just see the blonde hair hanging down behind her. He then attached a black feathery plume to the front of the headband and two leather cuffs joined by a sturdy chain to her ankles. 'A hobble.' He explained. As if she was going to go anywhere. He picked up a finer chain and with a silver screw clamp and ring at each end. Holding the one clamp, he squeezed and rubbed her nipple erect with his other hand. Pain shot into her breast and armpit as he attached the clamp and gasping from behind the bit, she looked down and noticed the jaws had rows of tiny teeth. The other nipple suffered a similar fate and the chain hung supported between them. He finally threaded the ends of some reins through the rings on the bit and attached these with locks to the rings on her nipples. Standing behind her, he gently pulled and released each rein then nodded as each breast rose and fell. Lucinda winced at the feeling. 'This is how you'll be controlled' he said. 'It's important that you learn this well as other drivers may well be quite be rough if you don't respond as expected.' Other drivers? Her nipples shrivelled at the thought. 'Ideally they'd be better pierced' he muttered and she lurched back slightly. 'We'll start the training later. Would you like to see?' She nodded eagerly. He reached to her face and the blinkers flipped over her eyes. She could just make out the lights on the ceiling where the camera lights illuminated the floor. She wobbled as Peter positioned her hips and, after a few moments, the light from the screen surrounded the darkness. 'OK,' he said, 'legs together, tighten up and show me those tits!' Concentrating, she gripped her arms, arched her back and thrust her chest up. Then, placing her feet together and tightening her knees she sucked the plug into her and pushed her vagina onto the dildo. Finally she levelled her head and relaxed her face to be expressionless like the ponies she'd so admired the previous weekend. She breathed gently. In her private darkness she was acutely aware of the many ways she was constrained, controlled and invaded. The blinkers flicked open. Before her stood two images of the most beautiful creature she'd ever seen this close. Tall and serene she was a perfect picture of how she imagined a pony girl to be. Lucinda couldn't believe it was really she. Smiling from behind the bit she took in the details she'd only partly been aware of and felt herself tingle with excitement. Was she really that tall? And her figure? She always though herself skinny, 'fried eggs' and 'snake hips' were jibes she was used to at school. The harness gave her curves! And very sexy ones at that. It also had the effect of drawing attention to her perky breasts with their silvery chain and reins and the harsh slash of the crotch strap dividing her labia. Next she looked at her profile view. The tail hung down in a thick bush. She pushed her rear back and swung her hips. The tail swished attractively with its weight giving her little sensations in her anus. The combined effect was one of mostly equine with the few human parts visible being those of her exaggerated womanhood. She still found it hard to really believe it was her image on the screen. The effect of Peter's domination combined with the relentless feelings of the tack, twin probes and clips made her acutely aware of her body but, at the same time, by amplifying her sensitivity to the point of almost continuous arousal diminished her awareness of the real world. She felt like she was in her own secure, warm space with only her sexual organs exposed to whatever attention people wanted to give them. It was much, much better than she ever imagined. She continued to swing her hips and sashayed around the room in a large circle, tossing her head at Peter and her sisters on the screen. The effect of walking made the dildo do interesting things to her vagina and its restraining strap likewise to her clitoris. She trotted up to Peter. He slipped an arm around her waist and she saw him look at them both on the screen. With the plume, she was taller than he. They looked a fine couple. 'Master and Pony', she thought. His pony, his slave, his woman, his love. She played the words over in her mind and felt the inner contentment of human affection to match her more immediate feelings of animal lust. 'Time to reward my Master' she decided as she remembered Princess and El.