Pat and Jerry had been married for 15 years. Their sex life was still pretty good and both kept in good physical condition. They had two kids, a son 12 and a daughter 9. Life was pretty good as far as Jerry was concerned. He had a good paying job and a nice house. What he didn't know, was that his wife had been involved with her dad in an incestous affair since she was 9, the age of his own daughter.

Pat's dad had come to visit for a couple of weeks. This was something he did every few months, as he was retired and widowed. The kids, Jimmy and Amy both loved to see Grandad come visit, as he was always good for some money. His excuse was that kids needed money "just because."

Jerry left for work on Monday morning. Pat and the kids met Grandad at the door around 10. He gave the kids $20 each and told them to go to the movies. As soon as they had left, Pat and her dad made their way to the guest room.

Within 10 minutes, both were nude and Pat was on her knees sucking her dad's cock. He knew his son-in-law wouldn't be home until 6 and the kids would be gone for at least another 4 hours. The theater was only a few blocks away and they walked it frequently.

He loved to see his daughter's lips stretched around his fat cock. He remembered the first time she had tried to give him a blow-job when she was 9. She had watched her older sister doing that and so much more. Sibling rivalry was alive and well in their house, and Pat had decided if her sister could pleasure daddy, she could too. She did. She managed to take all 8" in her pussy the first time he tried. It hurt, but she wouldn't admit it.

Grandad neared his first orgasm of the day, but held off. He lifted his daughter from his cock, and had her lay back onto the bed. Pat spread her thighs and held out her hands. Although she loved to have her daddy lick her pussy until she came, she knew the reason he didn't cum in her mouth was because he wanted to fill her pussy with his seed. She wanted it, and right now!

Grandad didn't hesitate. He plunged the entire length of his shaft into his daughter's wet pussy. Even after 2 kids and all these years of being fucked on a regular basis, she was still tight enough to feel good to him.

The pair grunted in mutual satisfaction as he bottomed out inside her. Pat's legs wrapped around her dad's waist and her hips moved in rhythm with his cock thrusting in and out of her body. Yes, they were deeply involved in the moment. So deeply involved, they didn't hear the door open.

The kids had made it only half-way when a passing car splashed Amy with muddy water. She wanted to go home and change. Jimmy knew if they hurried, they could still make the movie on time.

They didn't call out when they entered the house, but Amy went straight to her room. As she did, she passed by the guest room. The guest room with the open door and a plainly visible bed. A bed with her grandfather banging her mom. Amy turned and went back to get her brother, forgetting about her wet clothes.

Jimmy and his little sister stood at the door and watched their mom and grandfather for several minutes. He had to put his hand over her mouth to keep her from crying out at the site.

When it was obvious Grandad had finished (and mom did too, judging from her screams), Jimmy pushed his little sister back to the living room and out the front door. Once outside, he removed his hand from her mouth and they walked around the house, into the backyard where their playhouse was.

They had both spent hours in the little shed. There was a variety of cast-off furniture, including a sofa. This is where they sat, both with a bewildered look on their face. They both knew enough about sex to know that's what they had witnessed. Unknown to each other, they had both been doing a fair amount of masturbation for a while now. Jimmy had only recently started producing copious amounts of sperm when he came. Amy simply quivered and shook all over when her "good feeling" hit her young body.

"I can't believe they were really doing it," Amy finally said.

"I know. I mean, mom and Grandad? That's unreal! I wonder if dad knows." He had to shift around to hide the lump in his pants that was a result of the live sex show. It didn't help that erection any when he noticed his little sister for the first time in a sexual light. Amy's wet shirt caused her nipples to protrude through the thin material.

Amy saw where her brother was looking and casually pushed her chest out. "Do you like them?" she whispered. "They aren't big yet, still mostly nipple."

"I think they're cool," he whispered back. His hand tentatively reached out towards his sister's chest. She didn't resist, and even leaned forward. She sighed, her eyes closed as the first male hand touched her breast, even if it was over her shirt.

This was a first for Jimmy as well. He had often dreamed of touching a girl. His masturbation sessions often involved girls he knew and what he imagined they would feel like. Amy had fantasized about some boy touching her all over. Looking at Jimmy in a different light now, he was kinda cute and she was feeling those funny feelings "down there" so she might as well let him be the one.

As he massaged her breasts, Amy looked over at the bulge growing in her brother's shorts. She took a deep breath and reached over, placing her small hand over it. He gasped, but didn't pull away. They both knew they were too far gone to worry about incest taboo.

Without a spoken word, the kids sat back and began to undress. For each of them, it was a new and riveting sight. There was no shyness as they bared their bodies in front of their sibling. Hands moved back to their places, and bare skin touched bare skin.

Amy was amazed at how her brother's cock was hot and soft and hard all at the same time. Her fingers wrapped around it and when he moved into her fist, she started slowly pumping. Jimmy's hand reached not only for his sister's nipple, but also for the bald slit between her legs.

"Do you, um, wanna try what they were doing?" he asked his sister.

"I don't know what to do, Jimmy. Do you?"

"I'm not sure, but what it looked like Grandad was doing was putting his thing in and out of mom down there," he told her as he touched her slit again.

"I know there's a hole there, but I'm not sure if this will fit," she told him as she continued to stroke.

"Grandad's looked like it was fitting in mom ok. Do you wanna try?" His voice was raspy as his nerves almost got the best of him.

Amy moved to the sofa, releasing her brother's cock as she did. Jimmy followed his sister, admiring the developing curves of her young body. As she turned to lay on the sofa, he watched as her little pussy opened up and he saw the prize he was after.

Amy watched her big brother move across the dirt floor towards her. She wasn't sure what to do, but she had seen her mom's legs spread, and it only made sense that in order for him to put that in there, she had to make room for him to get between her legs.

He knelt on the sofa, and lined up the tip of his cock at her opening. It took a couple of tries, but when she put her hand on his cock, he almost came. When she guided the tip to her opening, he just shoved. When he felt resistance, he shoved again. When she screamed out, he froze.

"Are you ok, Amy?" he asked.

"Yeah, it just hurt for a second," she told him with teary eyes. "I'm ok now, go ahead."

He hesitated, but her pussy felt so amazing around his 12 year old cock. He pushed again, and met no resistance this time. When Amy wrapped her legs around his waist, he knew he was in. She was imitating her mom, so he imitated his grandfather.

Jimmy began to pump like he had watched through the guest room doorway earlier. This was so much better than jerking off to imagined girls! This was the real thing and he was probably the first of his buddies to do it!

For Amy, she had never felt so stuffed in her young life! Whatever her brother was touching inside her, she was feeling those special feelings that happened before she came. Her breathing was ragged now, and her eyes closed, as she tried to pull him closer with her legs. Without thinking about it, her hips were moving to match his strokes.

Before long, Jimmy felt that familiar sensation in his small ball sack. He knew he was about to cum. He didn't think about whether his sister could get pregnant. He didn't think about how wrong it was. His only thoughts were centered in the 4" of cock that was buried inside his sister's 9 year old pussy.

As the cum bubbled up from his balls, he held still and shuddered as he shot his first load into a female. He grunted and screamed out as he unloaded rope after rope of his incestous seed into his little sister.

Amy's orgasm washed over her as she felt her first load of boy-cum splash into her stretched pussy. When it subsided, she let her legs relax and her feet drop to the dirt floor. She looked up at her brother as he slid his softening cock from her now sore pussy.

"Wow, is that what it's supposed to feel like, Jimmy? That was pretty cool. Well, after the first part that is." She giggled, a little 9 year old girl once more.

Jimmy sat back on his heels, watching as his cum, mixed with her juices and a little blood, flowed slowly from his sister's red and swollen pussy lips. Her tunnel was slowly closing.

"I think so. I thought it was pretty neat, didn't you?" he looked hopefully at her.

"I think we need to pretend to leave again tomorrow and come back to see if they do it again!" she giggled. "Then, we can come back out here and do it again!"