Greg turned off the exit ramp and searched for a parking spot. Unfortunately, the rest area that he found was pretty dark, and there were not many cars. So he pulled the van up to the closest spot he could find and parked.

Greg turned the engine off and gave a refreshing stretch, as the long drive had taken its toll on him, and he couldn't wait to relieve that build-up of piss he had been holding in for such a long time. With a quick flick of his wrist, Greg opened the door and hopped out. Lifting one leg and then the other, Greg tried to shake off the stiffness. Only as he did that, he turned and glanced at the rear of the van and caught his wife and son watching him.

"I'll be right back," he said.

"I'll come with you, daddy," Steff grumbled, in the middle of a stretch herself.

"We'll wait here until you two get back," Dawn exclaimed. "I need a private moment to talk to Billy about something."

Billy swallowed hard and thought to himself. I'm in deep shit now. I don't think Mom's too happy with me. I'd better come up with something quick.

Greg gave his wife a slight nod and made his way to the restrooms with his daughter by his side.

Dawn watched as her husband and daughter disappeared into the distance. She tried to figure out how to talk to her son about what they did. As she thought about it, she then remembered the dream she'd had and what the dream was about.

Realizing what had taken place with her son wasn't all his fault, she looked him in the eyes and, with a stern appearance, began to speak, but before she could get a word out, Billy said, "Mom, I'm really sorry for what I did. I don't know what happened. It's like it was someone else controlling my body. It was making me do things I wouldn't normally have done, and I swear my penis was never this big until after I got bitten. I think that bite did something to me. It's making me do things. I think I might be changing into someone else."

Dawn saw the sincerity in her son's eyes and sighed, "Well, maybe there is some truth to what you're saying. But Billy, we can never do that again. Do you understand how wrong that was for us to do?"

Billy's eyes began to tear up.

"Yes, Mom, I hope you will forgive me. This is the worst day of my life."

"Well, maybe we should just cancel this trip and have a doctor take a look at you."

"Mom, please don't do that! Dad will never forgive me if this trip gets ruined on my account."

"There'll be more trips. Your wellbeing is my first concern."

"Just give me a day or two, Mom."

Then, with his head down, Billy said, "If it helps at all, what you did to me before seemed to help."

"In what way?"

"Errr. It's hard to explain, Mom, but that feeling of someone else controlling me disappeared."

"So you don't feel like that anymore?"

"Not right now, I don't, Mom."

Dawn paused for a moment and thought about what her son had told her. She felt sympathy for him. Then took his hand in hers and said, "Okay, we'll keep this to ourselves. No sense in getting your father upset over this."

"Thanks, Mom, and again please believe me how sorry I am. I love you, Mom."

"I love you too, Billy," Dawn replied before sliding over next to him and giving him a soft motherly kiss on his forehead.

She backed away and looked out the van's window, and said, "I wonder what's taking your father and Steff so long."

Greg did take a while in the restroom. It wasn't because of his need to relieve himself as much as it was to try to shake the haunting image that was plastered in his mind as he looked into the mirror.

But alas, he couldn't. So quickly, he threw some water on his face before making his way back to the van and thought to himself. I shouldn't be having those kinds of thoughts.

Steff was standing outside the doorway to the ladies' restroom when her father stepped out of the bathroom and said, "I didn't want to walk back by myself, so I waited for you, Daddy."

Greg smiled and opened the exit door for her and replied, "Ladies first."

Steff looked into her daddy's eyes and smiled before saying, "Thank you, Daddy."

They both took a leisurely walk back to the van, neither one in a hurry to return to the cramped confines of the vehicle, though each for different reasons.

Dawn watched the two dark figures as they approached the vehicle. She knew it was them.

"Billy, it's our turn to go. Put that sleeping bag in the front seat and put your sister's back here."

Billy quickly made the switch right before Greg opened the rear door, and Dawn stepped out.

"You have your talk with Billy?"

"Yes, everything is fine, but I'm still a little worried about that bite."

"He'll be fine, Honey, it was only a bug that bit him, and we don't have anything that could kill a person around these parts. I'm sure by morning, it will be all forgotten about."

"I hope so, dear."

Dawn walked to the back of the van and opened the rear door. She went through her clothes and found a pair of jeans, some clean panties, and a tee-shirt. She then looked for a clean pair of underpants for her son. Quickly she rolled her panties and her son's undershorts in her jeans and headed to the restroom.

"I'm going to change also, Honey. I don't want to drive in this dress. I think the cold will give me too much of a chill once we're on the road again."

Greg had already settled into the backseat and glanced up to his wife and said, "Okay, dear."

Dawn walked with her son. Once outside the restroom, she unrolled her jeans and handed Billy his underwear.

"Here, Billy, put these on, and give me the old ones back when we leave."

Billy took the underwear, and as he did, thought. I'm so lucky to have such an understanding mother.

"Thanks, Mom," he said before making his way to the restroom. Once inside, he stared at the mirror. So many thoughts were churning through his mind. What's happening to me? Am I really a sick pervert who just wants to fuck his own mother? Why is my dick getting bigger?

However, as he pondered over his predicament, that strange feeling started to rise once again. No matter how hard he tried to fight off the wicked, lustful feelings that were quickly filling his mind and body, he couldn't and was once again sinfully started to think of his mother sexually and croaked, "Oh no... Not again!"

Dawn entered an empty stall and relieved herself. Only as she did, her mind rewound to what had happened, and she felt herself strangely getting excited all over again. As if something was making her feel this way.

Hastily, she pinched herself for thinking such thoughts about her son once more. But try as she might, her mind kept picturing both of them as they pleased each other in the back seat of their car. Unable to control the sexual desire, she once again envisioned taking her son's massive meat down her throat. Steadily, her right hand ventured down her body until it slipped between her legs, and she sighed, "Oh fuck... I can't stop thinking about his cock."

With her eyes closed, her fingers lightly traced over her little bud while her mind replayed how she almost gagged, taking that massive dick down past her tonsils. Never had she ever sucked on such a large cock before, and strangely it excited her greatly when she immorally then wondered what it would be like to have it sinking deep inside her pussy.

Oh, fuck! I can't help it! This is going to make me come again... Dawn thought as her finger flickered over her now excited clit.

"I have to get it together. He's my son! I... I can't keep thinking of his cock like this... Oh fffuck..." she said as the first inclining of climaxing raced through her body.

But before it happened, the stall door shot open, and standing with his massive dick in his hands was her son and in his lustful state croaked, "I can't stop thinking about us either, mom!"

"Billy!" Dawn expressed as her son rapidly walked inside the stall and said, "I'm sorry, Mom, I can't help it. I need you again!"

Before Dawn could even say a word, he quickly pulled his mother to her feet and kissed her hard on the lips.

Dawn tried to push on her son's chest, but it was no use. Her sexual desire was rapidly overtaking her rational thinking, and instead of resisting her son's sexual advances, was now willfully kissing him back.

Realizing his mother's acceptance, Billy hastily reached down between his mother's legs and rubbed his fingers over her clit.

Oh, fuck! He's doing it again! My son is... Is playing with my clit! Oh god! Why can't I stop him! Dawn's mind screamed.

However, as her son toyed with her twat, her hand reached down and slowly stroked over his big, hard cock.

"Oh fuck, Mom! Your pussy feels so good. Please forgive me! But I have to make you come again!" Billy said right before jabbing three fingers inside his mother's snatch.

"Oh fffuck!" Dawn groaned as her body quickly responded to her son's prying fingers. She couldn't stop herself from thrusting her pussy forward, eagerly meeting his fingers with every surge.

Faster and harder, Billy worked his digits inside his mother's pussy while she rapidly jerked on his tool.

"Oh god! This... This is so wrong! So wrong!" Dawn cried while her climax built. But just before it peaked, her son hastily went down to his knees and latched his mouth onto her cunt. She could feel his tongue darting in and out of her pussy, and it immorally pushed her over the edge.

"Oh fuck! Billy! Wh—what are you do—ing! Oh fuck I'm coming!!!" Dawn screamed while pulling her son's head hard to her box as her body trembled in sexual delight from one of the hardest orgasms she'd ever experienced.

Now feeling drained, Dawn's body slid down the stall wall until her face was right in front of her son's massive meat. Still panting hard from her climax, Dawn glanced up at her son's face and, while taking hold of his dick, said, "This is the last time."

Billy only nodded before his mother ever so calmly moved her head closer to his cock while he held his hand on the back of her head. Then just as her lips touched the tip of his meat, he pushed forward while pulling her head with hands, sending his entire cock down her throat, and croaked, "Oh fuck, Mom, your mouth feels so fucking good!"

This time Dawn gagged as her son held his dick deep inside her mouth, but when he started to move his hips to fuck her mouth, she started to bob and suck.

Billy was once again in heaven. Whatever was happening to him, he realized there was no way he ever wanted her to stop sucking his dick. In fact, the thought of actually fucking her was even greater than before.

Faster and faster, Dawn bobbed her head. Yes, it was so wrong for her to enjoy this incestuous act, but she loved every second of it, whether she wanted to accept it or not.

"Fuck Mom! Oh, fuck! I'm close! Keep going! Oh shit! Oh shit! OH SHIT!!!" Billy groaned while holding his mother's mouth tight to his dick while exploding all his juices down her throat, and as it happened, that strange sexual urge he was feeling seemed to be also draining out of his body at that exact moment.

Dawn tried pushing on her son's legs as mounds of sperm flooded down her throat, almost choking her. It kept coming and coming, and as it did, that same strange tingling feeling as before could be felt inside her throat, tracing its way down inside her body.

 Finally, Billy let go of her head, and she quickly pulled away, gasping for air, and screamed, "What the fuck, Billy! I was choking!"

"Oh, god Mom! I'm... I'm so sorry! Fuck! What's happening to me!" Billy whined and felt his eyes tear up. It was true. Something was dreadfully wrong. He knew he was losing his self-control. Once again, he had let that strange sensation overtake him entirely, and he started to cry.

Dawn stood up and held her son in her arms as he openly sobbed on her shoulder.

"I'm sorry, Mom. I'm so sorry. I couldn't stop it!"

Rubbing her son's back with her left hand while patting him with her right, Dawn sweetly said, "It's... It's okay, Honey. Mommy forgives you."

Billy pulled away and looked into his mother's eyes and said, "It's gone again, Mom. But what am I going to do if it comes back?"

Dawn tried her best to smile and replied, "We'll figure something out. But, for now, let's just quickly do what we came here to do and get back to the car before your father wonders what happened to us."

Billy nodded as he went back to the men's room since he left his clean underwear over there.

Dawn quickly changed out of her dress, and into her new clothes while thinking. My god, I let him do that again. I know it was wrong, but for some reason, I couldn't stop myself either.

Billy calmed himself as he changed into his clean underwear. But before he exited the restroom, he thought. I need to try harder to control these urges.

"You okay, Billy?" Dawn asked as he handed her his old underwear.

"Yeah, Mom. Just wished things hadn't happened the way they did again."

"I told you, it's okay. I forgive you. Now let's get back."

Billy and his mother slid into the front seats.

Dawn looked back at her husband, who did his best only to take up half the rear seat with his body, lying on his left side, his head resting on the window of the door when she said, "Everyone ready?"

Steff, who was resting opposite in a mirrored pose of her father, said, "Yeah, let's get going."

Dawn adjusted the stereo, so only the front driver speaker was playing. She found a soothing station to listen to and tuned up the volume just enough for her to hear and not disturb anyone else. Happy with her choice of music, she put the van in gear and made her way down the highway.

Dawn hoped that the music would help her concentrate on the road and also get her mind off her incestuous sexual romps she more than willfully partook in.

An hour had passed, and the van was very quiet. Everyone but Dawn seemed to be getting some sleep.

But Steff was still awake. She was unable to sleep. What Dawn didn't know was that they had been seen, caught in the middle of the act, so to speak.

While they'd tried their best to keep their climaxes to themselves, Steff had heard! Steff had eased herself up from her position in the front seat and glimpsed over the top. She had been shocked by what she had seen. In the back seat, her mother and brother were having some kind of sexual contact; the expression on both their faces made it evident what was taking place. Steff had become fixated on the movement that she was seeing. She watched as her mother's and brother's breathing increased in speed and intensity. She exactly knew what they were doing. They were rubbing each other off. The look on her mother's face told her that she was very close to climaxing.

Steff didn't know what to do. Should she speak up and say something? Should she tell her father what was happening in the back seat? As Steff continued to watch, her pussy tingled and began to moisten. Steff couldn't understand it, but she was getting turned on by this.

As Steff watched, she became wetter and wetter, her excitement building as her mother and brother were close to reaching their own unthinkable climatic experience.

Steff squeezed her legs together and tried to ease the heat between her legs. Despite her attempts to control herself, her hand fumbled under her panties until it found her needing mound and began to stimulate her steamy pussy.

Steff looked over at her father, but he appeared to be carefully watching the road and was unaware of everything going on around him. Relieved, she let her fingers probe deeper inside her pussy. Faster and faster, she massaged her hard clit, and fingered her tight little cunt as she watched the forbidden sexual foreplay of her mother and her brother. She watched intensely as her mother reached her sinful climax and pushed her mouth hard into her brothers.

As that happened, Steff felt her own climax explode, and she pushed her fingers deep into her soaked little pussy to try to ease her body from quivering. Slowly, she slipped herself back down in the seat, her fingers still jammed tightly in her juice-covered twat, her breathing, sounding harsh in her ears.

Only then she heard what sounded like gagging; she glanced once again over the seat. Her eyes quickly filled with lust once more when she noticed her mom's head was now under the sleeping bag and was bobbing up and down.

Oh, my god! She is sucking on his dick! Her mind screamed, which only caused her to once again dabble with her twat. She could see by her brother's expression that he was thoroughly enjoying what his mother was doing, which only brought her closer to having another orgasm herself. Then, as her fingers jabbed deeper inside her little pussy, she lightly heard her brother grunt. He was coming, and she could see how he was holding his mother's head down on his cock while lifting off the seat.

She couldn't hold back herself, but unlike before,...