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.