The Thomas family was a typical suburban family. Bob was a forty – two – year – old executive with a small telecommunication company and a gym freak. His forty – year – old wife, Mary, could still qualify as a playboy model.

Their seventeen – year – old son, Jack, was a senior in high school and captain of the football team. Although he was fine among other guys, he lacked confidence around girls and never had a girlfriend. He often masturbated to thoughts of his mother.

Their daughter, Tiffany, was fourteen and blossomed early to rival her mother’s beauty and figure. From the age of six, she was in both ballet and gymnastics classes, making her agile and flexible. She was also a bit of a sex maniac, masturbating several times a day thinking about sex with her sexy brother.

Of course, Jack knew nothing about Tiffany’s sexual thoughts about him. They got along like most teenage siblings, sometimes arguing, other times confiding in each other. Their bedrooms were next to each other, so it was obvious to the other teen when one or the other masturbated and came. The actions of one teen commonly resulted in the other teen getting horny and masturbating.

Just before Jack graduated from high school, their parents announced that they were taking a two – week cruise in July and that Jack would be in charge at the house. Jack complained that it would interfere with his partying before going to college, but the parents insisted he take care of his younger sister. Tiffany also complained, stating she was old enough to take care of herself. Mary knew what kind of trouble a teenage girl could get into; she had been there herself and had an abortion at the tender age of fifteen.

“Tiffany, there’s no way you’ll be left unsupervised!” Mary exclaimed.

Tiffany knew better than to continue when she recognized the tone of voice her mother used and didn’t respond.

July came, and the parents went on their cruise. One of Jack’s responsibilities was transporting Tiffany to and from her ballet and gymnastics classes. On the second day that their parents were gone, he drove her to her gymnastics class. She wore a bodysuit that hid very little.

As he drove, he thought, “She looks more like Mom every day. ”

Tiffany went inside to her class while Jack waited in the car. The more he thought, the harder he got until he pulled his cock out and masturbated, cumming into a rag.

When she got into the car after class, she said, “It smells like sex in here. Did you jack – off while I was in class?”

“Yeah Tiff, I did, ” he replied.

“Who were you thinking about?” she asked.

“That’s none of your business, ” he stated, embarrassed about thinking of her while masturbating.

They drove home in silence. By the time they arrived, Tiffany’s muscles had tightened up, and she complained about it.

“Jack, my thigh muscles are getting tight. Would you massage them before I get in a hot bath?”

“Sure Tiffany, lay down on the floor and I’ll loosen them up, ” he replied.

She did as he suggested, then he straddled her left leg and massaged her inner thigh. When the muscles relaxed, he did the same to her right leg. He was about to get up when he noticed the crotch of her bodysuit was wet. Because of his inexperience with females, he didn’t know if it was from her class or he caused it.

Meanwhile, Tiffany thought, “He’s got me so hot I’ll have to get off in the bath. ”

“Okay Tiffany, go take your bath, ” Jack said as he reached for her hand to help her up.

She got up, and without thinking, started removing her bodysuit on the way to the bathroom, exposing her C – cup tits to her brother.

Jack was rock – hard from massaging Tiffany’s thighs, and seeing her tits caused him to explode in his pants. He went to his room to clean up and removed his pants and boxers. Grabbing some tissues, Jack cleaned his groin then put his soiled clothes in his hamper. He then slipped on a pair of gym shorts, going commando.

Meanwhile, Tiffany rubbed her clit and pinched her nipples in the bathtub, quickly having an orgasm. She then further massaged her sore thighs, bringing her another orgasm as the back of her hands rubbed her pussy lips. Now exhausted, she stood, drained the tub, and rinsed under the shower. After drying her body, she called out.

“Jack, I forgot my clean clothes before I got in the bath. Please get me something to put on. ”

“Tiff, just wrap a towel around you and get them yourself, ” he responded, unsure about cumming in his clothes again.

She did as Jack suggested and put on a pair of loose shorts and a t – shirt. When she entered the den, Jack was already there watching a movie.

“What movie is that?” she asked.

“I don’t know, I just turned it on. It looks like a romantic comedy, ” Jack replied.

“Oh good, at least it’s not an action flick. I’ll make some popcorn, ” Tiffany stated, then went to the kitchen.

While she was gone, he thought, “I don’t know what she uses in the bath, but I love that fragrance. ”

A few minutes later, Tiffany returned to the den carrying a bowl of popcorn and two soda cans. She handed Jack one can, sat down next to Jack on the couch, and placed the popcorn bowl in between them. As they watched the movie, they’d each occasionally reach into the bowl to retrieve some popcorn. As the movie neared the end, they both reached into the bowl simultaneously, and their fingers touched.

A spark seemed to jump from Tiffany to her brother. She reached over, her hands on either side of his head, and kissed his lips. Jack froze, having never been kissed before except by his Mom.

When he failed to react, Tiffany said, “Relax Jack, I know you don’t have any experience but I’ll teach you. ”

“But Tiff, you’re only fourteen!” he exclaimed.

“Yes Jack, I’m fourteen. I’m also becoming a woman and know what I like to feel. You’re about to leave for college and don’t know anything about how to make a woman feel good. Let me teach you. ” she implored.

“But Tiff…”

“No Buts, Jack, ” she interrupted, “lets just be honest with each other about our feelings. ”

“Okay Tiff, let’s be honest. Every time I hear you masturbating, I wonder who you’re thinking about. Tell me!”

“You big lug, it’s you that I imagine making love to, ” she admitted, blushing.

“Why me? There are plenty of guys your age who’d love to get in your pants, ” he asked.

“Because you’re my big brother and girls always idolize their big brothers. Also, because you’re defenseless when it comes to women; you have no idea how they think. Now, tell me who you think about when you jack off!” Tiffany insisted.

Jack turned beet red then said, “Until today, it was Mom. ”

“You jacked off thinking about Mom? That’s sick, although I’ve read that it’s fairly common. Did you meet someone new to think about?” she asked.

“No, Tiffany. I’ve known her my entire life, ” he admitted without saying it was her.

“You jacked off in the car thinking about me?” she inquired, knowing his answer.

“Yes Tiff, I did. That body suit you wore drove me crazy. When we got home, massaging your thighs got me going again and when you dropped the top of it going down the hall, I came in my pants, ” he admitted.

“Thank you for being honest with me, Jack. Now that our embarrassment is out of the way, we can teach each other what we like, ” Tiffany stated.

“You’re not mad about me jacking off while thinking about you?” he asked, amazed.

“Of course not, silly. I consider it quite a complement that you replaced Mom with me in your sexy thoughts, ” she explained.

“I don’t understand women at all, ” Jack said, exasperated.

“Well, we have twelve days left before the folks come home. I’ll start teaching you what we like tomorrow, I’m too tired right now, ” Tiffany stated before getting up, kissing Jack again, and going to bed.

Confused, Jack cleaned up the den before going to bed. He couldn’t sleep thinking about all the revelations of the day. He jacked off thinking about his little sister and his new desire for her rather than his mother.

They went to the local diner, where Jack treated Tiffany to breakfast. They were both dressed very casually, he in gym shorts and a t – shirt, she in boy shorts and a tank – top. They had a friendly conversation as they ate. Jack paid the check and left a decent tip for the waitress when they finished eating.

When they got in the car, Tiffany aggressively said, “Get us home, it’s time for your training to begin. ”

When they arrived home, Jack pulled into the garage, and before the door closed behind them, Tiffany took his face in her hands and kissed him. He surprised her when his mouth opened slightly, and his tongue swept against her teeth. She opened her mouth and let him in. Their tongues danced for a few minutes before she broke the kiss.

“WOW!” she exclaimed, “what a change from last night!”

“I couldn’t sleep, so I did some studying, ” Jack informed her.

“That kiss didn’t come from practicing in front of a mirror!” Tiffany exclaimed.

“No, it didn’t, Tiff. It came from a deep realization of how much I love you and want to be with you, ” he admitted.

“Be with me?”

“Yes Tiff, I want to be with you every way possible, including sexually, ” Jack adamantly stated.

“Jack, you’re inexperienced with women. Are you sure about this? If we start, there’s no going back!”

“Tiff, listen to me. I know you’re only fourteen, but you’re every bit a woman as Mom is. Until that spark when our hands touched last night, you were my kid sister. When I went to bed and tried to sleep, I realized that it wasn’t Mom that I masturbated to, it was the future you; the woman you would become, the woman I would spend my life with!”

As much as Tiffany wanted to believe this was actually happening, she wondered if she pushed Jack into these feelings. Before expressing any doubts, Jack kissed her again, his tongue probing for hers. She melted in his arms as his hands found her tits and played with her nipples beneath the tank top she wore.

“Take me to bed, Jack, ” she moaned.

He picked her up and carried her to just outside his room, where he changed position, carrying Tiffany across the threshold like a bride. He then set her down on her feet and slowly undressed her. When she was naked, he admired her body while she undressed him. They both lay on his bed, exploring each other’s bodies.

As she stroked his cock she said, “I need this in me, instead of just dreaming of it. ”

“Are you on birth control?” Jack asked.

“Yes Jack, for two years now. ”

Jack positioned himself and prepared to enter her.

As the head of his cock spread her pussy lips, Tiffany said, “Be slow and gentle. This is the first time for both of us, make it memorable. ”

Sometime during her gymnastics and ballet training, she had lost her hymen, so there was no pain as he slid into her love tunnel.

When he was halfway in her, she had some discomfort and said, “Jack, stop and give me time to get used to this wonderful feeling. ”

He did as she asked and waited for her go ahead. This also relieved the mounting pressure in his balls, preventing premature ejaculation. When she gave him the okay, he slid further into her until he bottomed out, fully engulfed in her pussy.

“I’ve dreamed of this for so long, Jack. Now fuck me like there’s no tomorrow!”

Jack slowly pulled out then pushed into her now sopping wet pussy.

“Don’t be a wuss, Jack! Fuck me hard and fast!” Tiffany demanded.

Jack thrust hard and fast into her pussy like a car’s piston.

“Yes Jack! Just like that!” Tiffany yelled.

Soon, her pussy convulsed around his cock, and she screamed, “YES! YES! YES!”

Tiffany’s pussy convulsing and squeezing around his cock triggered Jack’s orgasm. He pushed deep inside her and shot what felt like a gallon of cum against her cervix. When he finished cumming, he was still hard and inside her. He started thrusting again and quickly gave Tiffany another orgasm. He had already given her all the cum he had and pulled out of her. The two lovers, previously just siblings, lay there kissing and cuddling for over an hour.

They explored each other’s sexual likes and dislikes during the next week and a half. Tiffany discovered that she also liked being ass – fucked, and he found that he liked Tiffany shoving a finger up his ass while they fucked. He also tried using her vibrator in his ass and enjoyed that immensely. Tiffany also learned to deep – throat Jack.

The sibling lovers didn’t know that their parents purposely lied to them, telling them the return date was a day later than their actual return. When the parents returned home, they entered quietly, without announcing their arrival. They stripped and sat in the kitchen, making out, while listening to the moans and love – making coming from Jack’s room.

When the sibling lovers took a break to get drinks, they were shocked to see their parents sitting naked in the kitchen.

“Mom, Dad, ” Jack stuttered, “what are you doing here?”

“And why are you naked!” Tiffany demanded.

“Relax, kids, you’re not in any trouble, ” their mother, Mary, stated.

“Definitely not!” exclaimed their father, Bob.

“Kids, we suspected that you had feelings for each other, so we planned our trip to allow you time to become comfortable enough to express those feelings to each other. We gave you an incorrect return date so we could see if our suspicions were correct, ” Mary explained.

“But why are you okay with what happened?” Tiffany asked.

Bob said, “Have you ever wondered why you only have one set of grandparents while your friends have two sets? I’ll tell you why; just like you two, Mom and I are siblings, so are grandma and grandpa. ”

“So, incest runs in our family, ” jack stated.

“At least four generations, as far as we can tell, ” Mary confirmed. “You’ll make it five generations. ”

“So, when can Tiff and I start our family?” Jack inquired.

“To avoid legal problems, you should wait until Tiffany is sixteen before starting a family. Until then, she’ll continue being on birth control. Meanwhile, we have no problem with Tiffany moving into your room, Jack, ” Bob stated.

“But what about our future?” Tiffany wondered aloud.

Mary quickly responded, “We talked about that on the cruise. We’ll support the two of you until Jack gets his degree and gets established. By the way, Jack, Dad thinks you should major in Telecommunications; it’s an up – and – coming field. ”

And so it was that Jack got a telecommunications degree, started his own company, and brought his father to his company. Once the company was established and doing well, Jack and Tiffany bought a house in the next county, where nobody knew they were siblings. By the time Jack formed his company, Tiffany had two babies, a boy named Adam and a girl, Eve. A few years later, Tiffany gave birth to twins Delilah and Sampson.

Unlike previous generations, Jack and Tiffany’s children didn’t select an individual to become incestuous with. They decided to have an incestuous communal family where any sibling could have sex with another sibling if they approved.