During the weeks that passed, Tamara told her brother all about her fantasy.
She explained to him that it was necessary for her peace of mind that she take Golden Flash up the ass.
He thought that she was just being a silly little girl at first, and tried to laugh the idea off.
But the golden-haired beauty, whose tan was getting darker every day, was being stubborn with him.
In time Larry learned that his sister did not consider her fantasy a joking matter, and stopped being funny.
He gave the matter a lot of thought, and came to the conclusion that the unnatural act could be done.
It would just take the proper preparation. And that meant that Tamara would have to put up with a lot of pain.
He smiled when he thought that. He knew just the right big brother to administer the effective torture.
The sweet little blonde's asshole and bowels would have to be stretched until she could loosen those muscles enough to take the horse cock.
"I think we should stick increasingly large objects up your ass until you can take something as thick and long as his prick," Larry suggested that fall as the two were walking down a back country road watching the leaves turn brown.
"I don't think that it will take too much to stretch me," the little girl said. "My cunt has no problem taking that whole rod, after all."
"Still, Tamara, your pussy is supposed to be a lot more elastic than your ass. There is a difference in its function," Larry explained.
The little blonde knew that this was true and decided that they should begin her ass-training sessions as soon as possible.
Ever since Larry had started having sex with his sister, and watching her have sex with Golden Flash, he had more or less stopped going to the clubhouse.
The slur had left his speech and his eyes were as clear as bells.
Since Mom was home most of the time even though Dad was away a lot, the siblings didn't have as much time to be alone as they would have liked, and the sexual encounters between them had been limited.
But this did not prevent either Larry of Tamara from thinking about sex every walking second, and even during some of their sleeping seconds.
They knew that they would have to do most of their fucking in the woods, which was a drag because it was getting colder outside every day, and long spells nude could be rather chilly affairs.
Fucking in the stables late at night worked sometimes, but they didn't like to do it while the folks were home.
It was just too damn risky, and the consequences were so great.
Larry wished that Tamara wasn't his sister. If she were just his girlfriend he could take her to the clubhouse and ball her. But that was out of the question. His life would be worth nothing if his friends knew about his most private life.
So Larry drove into the city and went to a sex shop where he bought five dildos, the final one being a severe butt plug, probably not designed for sixteen year old girls.
For three weeks they met for an hour every early evening so Larry could fuck her in the ass – no lubrication – and then ream her out good with one of the dildos until she screamed in pain from the way her sphincter muscle was being abused.
"Now comes the final test before you are a-okay for Flash," Larry said to his sister late in October.
"What's that?"
"My fist."
"Oooooh, it makes me all goosebumpy just to THINK about it!"
Larry knew that he would have to get his arm inside her ass almost to the elbow to effectively simulate Golden Flash's prick.
It was a windy day on the outskirts of Henrietta. It was football season.
Tamara wished that she had learned to fuck in the spring so she would have reached this stage in her sexual development in the middle of the summer. They walked down a footpath deep into the woods, not far from Larry's clubhouse, but to a spot where no one ever went. The little girl pulled down her faded blue jeans and pink panties to her ankles.
She dropped to the ground on all fours and whinnied like a mare in heat.
She moved her knees far apart in the dried grass and arched her back so that Larry would have no trouble getting at the all-important back-door hole.
The boy dropped to his knees and pulled the cheeks apart so he could take a look at the bung hole itself.
It still looked very much the same. It still looked like a pink asterisk when she was clenching it tightly closed.
The amazing part was what it could do when she relaxed that muscle.
"Open up for me, Tammy," Larry said, watching with interest.
Her asshole opened like a mouth so the boy could see past the muscle into her bowels.
The flesh in there was fiery red and seething with lust.
He worked three fingers inside the hole easily and twisted them around.
"Give me the whole fist, Larry! I know I can take it!" she screamed.
The boy pressed his four fingers together and moved his thumb to the center of his palm, positioning himself so he could straighten his arm and get his shoulder behind the penetration.
Her asshole opened to take his hand and then squeezed at his wrist.
Once his hand was inside her butt he closed his fingers into a tight fist, and kept pushing so that her asshole crept up his forearm.
She whimpered and shook as she felt him push incredibly deep inside, but her face broke into a brilliant smile in spite of the pain.
"I CAN DO IT!" she screamed. "I CAN TAKE YOU, FLASH!"
The boy's eyes twinkled with delight as he saw her ass suck his arm inside a full foot. She had suffered the pain of being stretched to this extreme.
The training was over.
Larry's part was through.
Now, Tamara got her reward.
She counted the days to the next time her folks would be away so she could visit the stables.
Golden Flash's appearance changed as the weather became colder. The Arabian steed with the golden fur developed his winter coat. He looked larger with the heavier coat, and Tamara thought he looked even sexier than he did in the hot weather. It was early in November and Swede Knudson was about to take his wife to her mother's for the weekend, and though he would not be away as long as she, he would not be returning until the following morning.
That meant that Larry and Tamara would have the whole night to carry out their plan.
Tamara had been afraid that her ass would tighten from lack of use so she had been wearing the butt plug for an hour each day just to keep her sphincter muscle as maximum elasticity.
Tamara was doing her homework or at least she was trying to do her homework and Larry was in the living room watching cartoons on television.
The parents were upstairs getting ready to go out, and it seemed to the kids like they would never leave.
Mrs. Knudson made a list of everything the sibling lovers had to do while she was gone and attached it to the refrigerator door with a magnet, while Swede gave his standard lecture about drugs and alcohol. He didn't mention horse-fucking.
The second the folks left, Larry and Tamara put on their coats to go outside. They made their way to the stables and turned on the bare light bulb overhead.
The only light was near the door so it was dark and romantic back by the hay where the little girl would take her steed up the butt.
Tamara was convinced that she communicated with Golden Flash using a sixth sense that they both had.
She looked into his dark eyes and it was as if they shared a private language – a language that no one else understood. Larry was okay to have around, and he made her come when he fucked her, but he was only a tool in her plan to be the sex slave of her masterful steed. She knew that Golden Flash would know which hole she wanted his cock in. Besides, Larry would be there to help guide the horse prick in if Flash had difficulty finding the mark.
Tamara was too nervous to deal with the lock on Flash's stall.
She grabbed him by the ears and covered the horse's face with kisses.
He licked her with broad long strokes and his cock began to react to her scent.
"Tonight you get to fuck me in my asshole!" Tamara said.
She sounded so chipper one might have thought she was announcing that she had been asked to the prom.
Tamara began to pull open her winter coat and slip it back over her shoulders, to Larry's surprise.
"Why are you taking your coat off? All you really have to do is pull down your pants," he said.
"I don't care what I have to do," she said. "I only care what I want to do. I'm in the mood to be nude."
She was making her asshole open and close inside her jeans, a little nervous about what was about to happen.
Golden Flash was a strong beast, and it didn't make any difference how much the little girl had prepared.
Tamara had no idea what was going to happen once the steed began to push his prick up her butt.
She dropped her coat in the straw on the floor of the stables and unbuttoned her flannel shirt as she walked back toward the haystack.
She could feel her nipples growing very hard. She was so excited about what was going to happen that she didn't even notice that the air inside the building was quite cold.
Tamara was unaware of her thick goose-pimples.
She could feel her heart pounding wildly, and her chest heaved, her breasts moving up and down, as she gasped for air, panting furiously with the desire she felt in her bowels.
"I have received your come in my mouth many times, and in my cunt many times. Now you will fuck my third and last hole. Oh, Flash, I know you know how long I have been looking forward to this moment."
Tamara pulled off her shirt and threw it carelessly aside.
She rubbed her fingertips over her nipples so she could feel them throbbing.
She pinched lightly at her nipples and then cupped her breasts in her palms.
Larry had taken the horse out of his stall and was leading him toward the back of the stables.
Tamara kicked off her shoes and reached down to pull off her socks so she could wiggle her bare toes in the straw.
She quickly unbuttoned the single button that held the top of her blue jeans together and pulled her zipper all the way to the bottom, so she could hook her thumbs underneath her outer and underwear and pull them down over her small round hips with a sexy wiggle.
Larry was really looking forward to watching his sister get reamed by the horse. He knew that this was going to be even wilder than watching her take it in the cunt.
This time the teenage boy had been smart. He had snuck a small camera in his coat pocket before he left the house.