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On Saturday morning, Lisa and Bart got up early at around seven. Marge was also up and was glad that her children were now taken the chore of walking the dog, which gave her more time to wake up properly and make breakfast, although she was confused to why Lisa brought her backpack with her.

The Simpson kids got to a nearby park that was pretty empty since a most people were sleeping in late because it was Saturday. Bart and Lisa hen went to a part of the park that was known to be the place were annoying college students hung out, which made all none-students avoid the place. Since it was Saturday morning however, all college students were still in bed so Bart and Lisa knew they had loads of privacy.

This meant that Lisa could be pretty sure that nobody would see it when she stripped naked and pulled from her backpack a leash and a collar, a headband with floppy dog ears and a bushy-tailed-buttplug, which she all put in her butt.

Bart then walked Lisa around the park while she acted like a dog, with Santa's little helper walking besides them, curious at what its masters were doing. It figured that it had something to do with mating and was allowed to lick at his female master's vulva, put was dragged away when he tried to mount her.

Bart was getting aroused seeing her sister naked, crawling around like a dog on the park grass and also liked it when SLH stuck its head up to Lisa's butt and started licking her cunt. He however didn't want the dog to fuck Lisa first since he wanted to do that.

Eventually Bart had enough and tied SLH to a tree, and then he pulled out his dick and presented it to his sister. Lisa then immediately began licking it franticly like a dog would, but Bart wanted more and forced his dick into Lisa's mouth and began fucking her face. Lisa was an obedient dog to her master and allowed it, and Bart complemented her, by telling what a good girl she was.

Once his dick was fully hard and covered with Lisa's spit, Bart had then moved behind Lisa, who was still on all fours and then he inserted himself inside her bald pussy. Lisa gave barks of approval as Bart began mating with her right there in the park.

Bart kept a steady pace going while he listened carefully for anyone approaching. It was both distracting and a turn on for Bart's lovemaking, and he wanted to tell Lisa to quiet down so he could hear better, but her cute barking really got him going.

Finally, Bart came and shot his love juice inside his sister's pussy. Lisa then gave a moan and a loud howl as she came as well, her pussy clamping down around his shaft to milk more sperm into her still infertile womb.

After a couple of moments of resting, Santa's Little Helper's whining got Bart's attention. Bart could see the tied up dog's stiff red penis and could tell it was aching to fuck Lisa. Bart gave a smile and then pulled out of his sister. He then pulled the butt-plug out of her as and then used the fluids from her pussy to lubricate her brown port.

Satisfied, he went to untie his dog and lead it to the blond eight-year-old. SLH quickly mounted her and Lisa helped it find its way into her tail hole. As per usual form it began hammering away right away, not caring that it was the wrong hole for puppy making and Lisa gasped and moaned it its vigor.

While SLH mated with Lisa's tight tunnel, Bart presented his juice covered cock to Lisa and she immediately took it in her mouth and began sucking it clean. He moaned and petted her head, again talking to as if she was a dog while he enjoyed the sight of her began taken by her dog.

It continued for a while but as usual SLH didn't last long and Lisa gave out a painful gasp as she felt the brown dog's knot enter her rectum and felt her second hole being filled with sperm.

While Lisa remained tied to the family dog Bart kept her to task of blowing him, and after a couple of minutes he climaxed for second time and gave her the first meal of the day in form of his nutritious seed.

After Santa's Little Helper had unknotted with Lisa and they had cleaned washed their privates at a park restroom they went back home. On the way Lisa asked: "I'm guessing you are going to a lady today, but what about tomorrow, are you busy then?"

Bart: "Two ladies in fact, Sherri and Terri. I don't have any plans for tomorrow yet, but some girls have asked me, but I haven't said yes to anyone yet, why do you ask?"

Lisa: "I was thinking maybe you would like to spend the day with me."

Bart: "Well maybe, but you know me, I like to get around and we do it every day anyway. Besides we have done practically everything, so do you have anything new in mind?"

Lisa: "I have some ideas, but they are surprises. Please be good big brother and hang out with your little sister."

Bart looked thoughtful for a moment and then said: "Fine, but then I get to have your two desserts for the weekend and you'll do my homework."

Lisa: "What, really? You get to have sex with me and do the other things which I have planned, and you want to get bribed. Fine, I'll HELP you with your homework and you can get my desserts. Deal?"

Bart: "Deal."

---

Breakfast was ready at the Simpson residence when Bart and Lisa came back and they had their meal in the usual loud manner together.

After breakfast was done each family member went to do different things. Homer watched TV, Marge did chores, Bart went to see the purple haired twins and Lisa took her bicycle and went to the outskirts of the city, where the old, horse breeder, lady, Millicent had her stables, "The Grateful Gelding Stables".

It was there where Homer had bought Lisa's horse, Princess, but it had to be returned when the family couldn't afford it, but Lisa still visited it. It was also there that the race horse, Duncan had ended up after the family had owned it.

Millicent greeted the young girl as she arrived and led her to the stables where she could be with the horses. The old lady did like the 8-year-old and definitely wanted to give her job, if she wanted when she got older, since the horses were always happier after Lisa had arrived.

Lisa went to the stables where Duncan and Princess were and petted them both and enjoyed that they got along. She would love to see them mate, but knew that Millicent kept strict control over the breeding. Lisa then instead found a horse brush and started brushing Princess's brown fur.

The grooming continued for a while as Lisa made sure to brush the entire body. She slowly made her way down the horse's body and got to it's rear. Normally it was unsafe to stand directly behind a hose but Princess knew what was coming and moved its tail away to reveal its large horse vagina. Lisa smiled and then went and locked the stable's doors before stripping until she was completely naked.

She then went back to the female horse and placed a small wooden box behind it so she could be at face height with its vulva. The horse then gave a satisfied neigh as it felt the blonde's small tongue begin to explore its dark skinned folds.

Lisa inhaled the strong odors seeping from the horse vagina and after letting he tongue trace around the folds a bit, she decided to just bury her face in the large slit. Princess huffed and stamped its hooves in approval as she felt the young human go wild on its pussy.

Lisa soon had to come up for air however and had to take a breather before diving back again, but after hearing disappointed noises from the horse every time she stopped, she decided to replace her face with her hand and started inserting it.

Due to the smallness of her hand compared to the horse cunt, it slipped easily in and soon she had her whole arm buried in the mare and began banging away, Princess again neighed in appreciation as Lisa's arm was a decent replacement for a horse cock, that it seldom was allowed to get.

Lisa kept fisting the brown mare until it eventually let out a loud neigh as it orgasmed.

Lisa felt the orgasm juices cover her arm completely, and she withdrew it and began licking it clean. She then then went back to licking the pussy to get more juices from the hole. Princess made noises of delight again and soon rewarded Lisa with another dose of horse love juice as it climaxed again and Lisa greedily licked it all up.

Duncan neighing drew Lisa's attention and she could see it wanted some care to, so she went over to the white stallion and began grooming it while she tugged at its hardening horse member.

She let the long pink and brown dick grow hard in her hand and then she rubbed it all over her prepubescent body and let it poke at her pussy. She gave a disappointed sigh since it was still too big to go inside her. She instead went down on her knees and started licking the long rubbery shaft.

The former race horse neighed in approval as it felt the small tongue on its cock. It didn't get much sex either and it would be perfectly happy to bang the living delight out of the small human, but could also feel its flat penis head couldn't enter her yet.

Lisa eventually made her way up to the flat penis head and just managed to put it inside her mouth and sucking on it. She soon sped up her efforts on sucking, licking and kissing the dickhead as she heard the unmistakable sounds of an impending orgasm, and sure enough it didn't take long before Duncan's penis became a firehose and shot out an entire gallon of horse cum which covered most of Lisa's body.

Lisa greedily licked up as much of salty liquid as she could, but then she had to use a water hose to wash herself off before redressing.

She then said her goodbyes to horses and Millicent before heading back home.

---

Once home Lisa did her favorite past time activity of reading and she had fun with it for a couple of hours, until she could hear her sister Maggie let out a cry. Homer was absent and her mother was preparing dinner, so Marge called on Lisa to help.

Lisa gladly did and quickly found out what the problem was as she could easily smell her younger sister's dirty diaper when she entered the living room. Lisa then gave a smile and took Maggie up to the toddler's room where she could be changed.

Lisa closed the door and turned off the baby monitor, then quickly got rid of the dirty smelly diaper and started cleaning up her sister. She didn't put a new diaper on her sister however, since she also had taken to be perverted with her sister, which Maggie seemingly also enjoyed.

After Lisa felt her baby sister was clean enough, she lowered her head to her small sex and began licking at it with her tongue. Maggie cooed and giggled at her big sister's action as she enjoyed it, and wondered why her mother never did that to her.

Lisa continued licking Maggie's little flower until she heard scratching at the door and she knew who it was, because not only had she begun dong lesbian stuff with her sister, but the junior genius had also begun teaching her to have sex with animals. She went to the door and let both Santa's Little Helper and Snowball II in, before closing the door behind them. Normally Lisa would have to find them, but this time they had come on their own accord.

Lisa then decided to lock the door just in case, and then stripped herself and then her sister completely naked. Then the two girls found an animal partner that suited the seize best; Lisa went with SLH and Maggie with SB2. Lisa was actually a bit jealous of her sister since she seemed to have a better connection with the cat since Snowball II never appeared opposing when it was with her and she also had a good relationship with SLH.

The two pets knew the drill as Lisa and Maggie guided them to lie on their backs and soon they felt their human masters rubbing and licking at their sheaths to get to their cocks out for sex. The two girls started by licking the furry balls, waiting for their dicks to emerge and when they came out the two sisters began sucking and licking their red meat.

Lisa gazed over to her sister and got a sense of pride as Maggie did everything that she had taught her. She however knew that once Maggie would learn to speak she might tell their parents about their beastiality, so she had to be on top of that.

The sisters continued sucking off their pets for about a minute until they were ready and then the two girls went on their hands and knees and waited to be mounted. Again Lisa felt a bit jealous since Snowball II mounted her sister without any fuss, but was soon distracted from that by the feeling of extra on her back as Santa's Little Helper mounted her and jabbed its penis at her nether region until it found its mark and penetrated her soft pussy.

Lisa and Maggie moaned in unison as the respective partners mated with them over several minutes. SLH was as always the first to come and Lisa gave a yelp as she felt the dog's knot enter and lodge itself in her tight girl cunny. She then felt the familiar sensation of dog cum splashing her inside and she let out a satisfied sigh.

Snowball II came shortly after and filled Maggie's young pussy with its kitty milk. it then quickly dismounted the toddler and proceeded to lick its cock clean, while Maggie laid down her back and playfully rubbed her used pussy.

Lisa didn't have that freedom, since she was stuck with the family dog, but after some minutes she too was able to be disconnected from her lover.

Lisa then cleaned up what needed to be cleaned and then got dressed and then dressed her sister.

Homer and Bart came home soon after that and then it was time for dinner, where Homer and Bart amused with tales of their wacky antics, although Lisa knew her brother omitted some details. Then after dinner it was time to spend some time with most important member of their family, the TV.

---

Then late in the evening after Homer and Marge had gone to bed and after Homer's noisy snoring had begun, Bart began moving to his sister's bedroom.

In there he got a bit of a surprise as he saw not only Lisa but also Maggie, both being naked except for white socks on hands and feet with paw prints on, headbands with floppy dog ears and Lisa had the furry-butt-plug she had been wearing in the morning. "Woof, Woof," Lisa said and sat down in a dog like manner. Maggie also made a dog sound and began rolling around playfully as a dog would do, since she thought it was part of the game.

"What is she doing here? I told you I don't want to involve her." Bart said annoyed but Lisa just whined dog like as a response. "Could you please speak like a human? I'm not doing this." Bart said but Lisa again just made a dog like whimper. "Fine, you can lick her while I fuck you. Now, get my dick ready." Bart said and began removing his green pajamas and Lisa gave a happy bark. Bart then got naked and got on Lisa's bed. Lisa immediately joined him and began licking his already semi hard shaft.

Maggie saw what her siblings were doing and wanted to join in, so she got on the bed with them. Bart's human dick was a bit new for the toddler since she had seen cat and dog dicks, but seeing her older sister licking Bart's groin assured her that it was just the same. Bart wanted to object but looking down at his two sisters eagerly licking his dick made him shrug and just enjoy it, with one sister servicing his shaft while the other serviced his balls.

Bart didn't necessarily have a problem with having sex with his youngest sister, he just wanted her to be a bit older and able to talk, so he could know it was alright. Granted Lisa mostly did animal noises when they made love, but she could at least say no if needed. Bart was pretty shocked when he found out what Lisa was doing, since she was usual the more responsible one, but he did like how she became more and more deviant.

"Lisa, get in position." Bart finally said after a couple of minutes of fellatio. Lisa gave a happy bark and then placed Maggie on her back at the head of the bed, got her head between the toddler's legs and began eating out her sister's vagina, while she had her ass up in the air, waiting to be mounted. Bart did just that as he quickly got up behind Lisa, inserted his cock in her wet pussy and began mating with her.

The three siblings moaned in unison as they had sex. Bart and Maggie made eye contact doing the act and both knew they would eventually have sex, maybe not that evening, but Bart certainly wanted to lick her little pussy and he hoped that Lisa had taught her a thing or two about sucking cock properly.

As Bart felt his orgasm drawing nearer he actually changed his mind on where he would shoot it. He pulled his dick out from a disappointed Lisa and moved up the bed so his cock was mere millimeters from Maggie's lips. "Suck." He ordered and it was unclear if she understood what he said but she certainly understood the intention and began sucking the dickhead, as it was as much she could fit in her little mouth.

Lisa was at first dissatisfied by Bart not finishing with her but she was happy that Bart was getting into playing with Maggie, so she joined in by diving down and sucking Bart's hairless balls while Maggie continued with the head. Bart came shortly thereafter and filled his youngest sister's mouth with his hot cum, which she eagerly sucked up.

"Come my doggies, make my hard again for Lisa, so she can get her load as well." Bart said as he laid down and made himself comfortable while his sisters obediently started performing oral sex on him. The young boy just laid there and enjoyed life until he eventually said: "Okay, Lisa give me Maggie so I can eat her out, while you ride me."

Lisa preferred a sex positions where she would be in dominated position but she decided to humor her brother. She helped Maggie straddling Bart's face and he immediately began licking her tiny slit, which made Maggie cue in delight.

Lisa then straddled Bart herself in the cowgirl position and gave a pleasured moan as Bart's boyhood once again entered her pussy. Lisa then began bouncing up and down hard on Bart's thick stick while enjoying the sight of her Bart licking Maggie's pussy, and she knew how great he was at it. She also noted he played a lot with her ass and smiled knowingly that Bart would stick his dick in their sister's butt as soon as she could accommodate him.

The trio continued for several minutes, during which Bart made Maggie come to by his excellent tongue work and Lisa brought herself to an orgasm by riding Bart's shaft.

Bart followed soon after Lisa and she gave a pleasured gasp as she felt her brother's hot load spray inside her tight tunnel.

Lisa then let Bart's cock slip from her insides and laid down next to her brother. Bart meanwhile guided Maggie down from his face and onto his bed to lie next to him to rest for a bit in the after.

Bart and Lisa however knew they couldn't fall asleep since they couldn't be found by their parents in their revealing state the next morning, so they forced themselves to stay awake. However, they soon heard Maggie starting to snore. The two oldest siblings then smiled at each other and knew that was it for the evening.

Bart then helped Lisa clean up and put Maggie back to her crib before they kissed each other goodnight and went to their respective beds after another eventful day.