Chapter 4

The girls had endured two hours subjected to their brothers frequently sadistic and sexual tests. They masturbated frequently while he watched. They also did jumping jacks so that their tits and asses bounced. Their mom almost walked in to check on the noise. Justin told her they were playing a game. Tami was shocked all her kids were getting alone but happy to have a drama-free Saturday and didn’t question it.

Tim watched the entire thing go down. Tyra and Julie filled him on the new rules they had agreed to when Justin left the room. Tyra explained that they had gone double or nothing. The girls teased each other over who would be the first to “pussy out” and quit. They both seemed inclined to continue for as long as it took to determine a winner.

Tim thought they were crazy. He warned them he would make them both keep their word though. “You both wrote a check I don’t think your ass can cash!” he chuckled.

“Have you seen the size of Tyra’s ass?” Julie teased her older sister.

Julie also told Tim that if Mom suspends them or puts them on restriction that she wins the game.

“So why not just walk out in the living room butt naked and sit on Buddy’s lap? Mom will hit the roof – game over,” Tim chuckled.

Tyra said it wasn’t that simple. “If Julie did that without being told to by Professor Tinydick that would not count,” she joked and assumed her little brother had a little cock to match.

“Yeah, plus I don’t think I would ever be able to live down doing something like that,” Julie added.

“Oh, you are going to do some NASTY shit. You are going to need a bucket and a mop for that wet ass pussy,” Tyra giggled the lyrics to a popular rap song and promised her sister would be horny for days.

“I think you two LIKE doing this game,” Tim observed.

The girls both scoffed at the very notion of Tim being right. They told him that this game was just a means to an end to determine which of them was willing to go the distance to win.

“You keep complaining and bitching but I notice smiles on your faces when Justin tells you to something naughty,” he observed.

“That’s just part of the game. We are his little puppets on a string to be tested,” Julie observed snarkily. Tyra agreed with her sister and dismissed her brother’s suggestion.

When Justin returned he made the girls spank each other with the ruler and hair brush until their asses were a rosy pink as well. It was something Tyra excelled at and really enjoyed doing to Julie. Their butts were glowing from an afternoon of use and testing.

“What is this, Test subject B?” Justin held up a hair brush.

“My hair brush, Doctor Riggins,” Tyra rolled her eyes. He was wasting time as far as she was concerned. This felt like a pointless exercise to her.

“What do you want to do with it, Test Subject B?” Justin asked.

“Shove it up your ass,” Tyra snickered. It was the same answer she and Julie gave three times in a row.

Justin slapped her fat tits with the back of the hair brush. It wasn’t hard and the pop actually electrified Tyra’s sensitive nipples. She didn’t want to admit that it made her gush when he played with her nipples or Justin would probably never stop.

“You like shoving things up your own ass,” Justin repeated the instruction. He was trying to program the girls mentally. He didn’t want them to enjoy ALL of the tests. If they did only what they liked he would never be sure if they were still obeying him or simply hedonistic pleasure seekers.

He wanted them to enjoy this particular exercise. He wanted his sisters to see it as a reward and to prefer it over clitoral stimulation. He could tell from the way their bodies got flush and their pussies got wet they enjoyed that tremendously. He didn’t want to stop them from enjoying that either.

Both girls had a lemony frown on their face when they had things shoved up their ass. Justin had shoved various household objects in their asses after lubing them up and was working on the hairbrush they used to spank each other right now.

He theorized that he could make them enjoy taking things in the butt but ONLY when he permitted it.

“You enjoy having things shoved up YOUR ass,” Justin sounded frustrated as he repeated the command to his sister.

“Maybe they just like the idea of shoving things up YOUR ass more than they do their own,” Tim chuckled playfully.

“Are you familiar with Pavlovs Dog?” Justin asked his brother.

“Is that the Mexican guy that lives a few trailers down?” Tim had no idea what his brother was talking about. Justin frequently described his experimental theories to the others but none of them had a clue what he was talking about.

“Pavlov was a Russian Scientist in the 1890s. He from the idea that there are some things that a dog does not need to learn. For example, dogs don’t learn to salivate whenever they see food. This reflex is ‘hard-wired’ into the dog,” Justin explained.

“So we are dog’s now?” Tyra offered her brother a grimaced. She was naked standing with her legs apart, knees bent and hands behind her head.

Justin ignored his sister’s question. She was a lab specimen to him now and he only interacted with her when he felt she needed to be given an order.

“Like many great scientific advances, Pavlovian conditioning (aka classical conditioning) was discovered accidentally,” Justin smiled. He felt his special mind control tea formula may have been an accident. He wasn’t convinced the Cantharidin extract was the only active ingredient.

Tim had stopped listening a long time ago but Justin continued his explanation.

“During the 1890s, Russian physiologist, Ivan Pavlov was researching salivation in dogs in response to being fed. He inserted a small test tube into the cheek of each dog to measure saliva when the dogs were fed. Pavlov predicted the dogs would salivate in response to the food placed in front of them, but he noticed that his dogs would begin to salivate whenever they heard the footsteps of his assistant who was bringing them the food. When Pavlov discovered that any object or event which the dogs learned to associate with food (such as the lab assistant) would trigger the same response, he realized that he had made an important scientific discovery. Accordingly, he devoted the rest of his career to studying this type of learning,” Justin said.

Tim was shocked when Justin stopped talking. He realized Justin expected him to say something in response.

“Cool,” Tim replied.

Justin seemed to expect a little more.

“Let’s make them act like dogs,” Tim smirked.

Tyra glared at her brother. Tim frequently offered little dares and suggestions to Justin. Justin had never interacted with the female body before and Tim was able to keep him rooted in reality of what could realistically fit up the girl’s asses and down their throats.

“Capital idea,” Justin told the girls to get on all fours and crawl over to him. He lotioned up the base of the hairbrush and without asking he pushed it all the way into his Tyra’s asshole to the bristles. It gave the impression she had a short, bushy tail.

“Can I do it myself, please?” Julie realized she was next. Justin was brutal and never took the time to work things in the girl’s asses. They had been stretched out through the constant stimulation and exercising but he seldom considered their comfort. If he did it was for clinical observation only.

“You will let me shove this tail into your ass,” Justin whapped her pretty round butt with the flat of the brush and then slid it into her ass without any resistance. Julie didn’t fight him.

Her resolve to continue this absurd game had waned several times this afternoon. She wanted to cry, she was blushing, she was humiliated some of it turned her on, and she just wanted to process all the strange feelings she was having.

Yet, anytime Julie reached her breaking point she would look at her older sister’s smug face and get a second wind of fortitude.

Now, Justin was instructing them to bark and yip like playful dogs. Tyra rolled her eyes at first but once she started sniffing around and wiggling her ass she got into it. Tyra pounced on Tim and licked his face.

Julie joined in and sat up and begged with her tongue hanging out. She put her hands up in the air and panted like a dog.

The girls grew less inhibited as they laid things on thick. The fact that they were really in on the joke and it was Justin who was being played made it easier for them to rationalize wagging their tails and playing fetch with their things that he tossed around the room. Julie and Tyra chased after the ball and dropped it in front of him so that he could throw it again. They began to race each other and even push each other a little as they crawled after whatever he threw.

“It is time for your tea,” Justin’s boner was so massive that he could barely walk out of the room. He abruptly left while the girls were still in puppy mode.

As soon as he shut the door they stopped immediately. Tyra’s expression went from playful puppy to sour grimace in a split instant. She had fun playing puppy but now that “the jerk” was gone she was free to behave like her normal self.

“Are we supposed to keep acting like dogs?” Julie’s mouth popped open slightly as she caught her breath. The girls remained on the floor in case Justin walked back in unexpectedly.

“I think so,” Tim shrugged. “You are supposed to be Chekov’s dogs aren’t you?” He had not heard a word of what Justin told him about Pavlov. He assumed Pavlov was the same guy who played a Helmsmen on Star Trek.

“I get confused some times. He tells us we are supposed to like it and it’s hard to pretend to like being treated like a dog,” Julie

Tyra rubbed her sister’s hair playfully. The girls had made out all afternoon for the first time ever and now they were a lot closer physically. “Oh, you looked like you were enjoying it, Sis” she teased her.

“I mean it was fun, or funny I guess” Julie admitted sheepishly. She didn’t want to admit that it was the strangest thing she had ever done and yet weirdly liberating to her once she started play-acting like a dog she forgot she was a person.

“I think it would just be easier if we really WERE under a mind-control,” Julie laughed playfully.

“Where is the fun in that? Then I couldn’t own your pretty ass when you finally give in. Don’t worry, I’ll find a nice kennel to display you in for my friends,” Tyra was teasing but only a little.

“Do you think Justin knows we are play acting on some level? I mean Justin can’t really believe that tea would make us do all of this can he?” Julie changed the subject. The girls were nude on all fours but were able to take a quick break between games.

“Doctor Riggins? I think Justin buys this hook, line and sinker,” Tyra was certain of that. “He would never shove things up my ass if he thought I was play-acting because he would know I might snatch him by the back of his scruffy little neck and snap him like a twig,” she chuckled.