As the sun rose in the distance, Dawn noticed the sign up ahead to the campground.

"We're almost here," she announced in a loud voice, which caused everyone to stir throughout the car as she looked in the rearview mirror.

Billy, still groggy, was the first to sit up. Looking around as he took a deep stretch, he asked, "You drove the entire way, Mom?"

"Yea, I was in the mood for a long drive."

Greg now straightened up but didn't address himself right away, since he was still scared of what Billy might say.

I'd better play it cool for a while, he thought to himself.

Billy looked into the backseat and said, "Morning, Dad. Did you sleep alright back there? I know how little space there is."

"Umm, yea, I did Son, I can't believe it myself."

"So, where are we going to set up camp this year, Dad?" Billy asked as if he really cared.

"I thought up by the lake. That is, if everyone is alright with the long hike."

"That sounds great!" Steff spoke while she stretched and expressed with glee, "We'll be able to go swimming."

Dawn looked back in the rearview mirror at her husband. Then, in a huffy voice, she replied, "I wish I knew this back at the house. I would have packed my bikini."

Greg paused, realizing his wife was a little upset with that news and figured he needed to come up with something quick and replied, "Well, listen, Honey, when we get to the campground, Billy and I could stay there while you and Steff head up the road to town and find a new bikini."

"Clothes shopping. This trip is starting off fantastic already," Steff announced excitedly.

"I guess we could do that. You two wouldn't mind waiting around for us at the campground?"

"No. I think Dad and I will be able to find something to do while you two shop," Billy replied, knowing full well that his dad would want to try to talk his way out of what he did with sis.

"Okay then, I'll try and hurry to find a suit."

"Hey, Mom, I think I need a new one also," Steff interjected.

"Steff, we don't have time for you to try on every bikini in the store."

"Aw, come on, Mom. I'm not that bad, and besides, I would only be waiting around for you to find something."

"We'll see, but no promises."

Shortly after they had left, Billy felt a strange tingle through his body again, and his dick increased in size.

"Oh no, not again!" he said to himself.

Billy's mind drifted, and his vision went back to seeing his mother bent down on her knees in front of him. He imagined how great it was when she opened her mouth and took his dick inside it before slowly blowing him.

Only as he relished in what it felt like to have his penis sucked off by his mother, his mind then pictured how his sister was watching them when he exploded down his mother's silky throat. 

That notion caused his mind to go crazy, even though it never took place. He then envisioned his sister slamming her ass against their father's dick, screaming out loudly in ecstasy as he was pulling her into him with both hands on her waist, ramming his cock deep inside of her.

Only his mind wandered again, and now he could still see his sister's face as she screamed in her climatic state, but the man that was fucking her brains out wasn't her father anymore; it was he.

Billy could feel his cock at full hardness, almost poking out of the top of his jeans. Overnight, it must have grown another 2 inches.

Lost in the enjoyment of the new thoughts traveling through his mind, Billy tried to overcome them and bring himself back to reality, shaking the incestuous images that were haunting him.

Billy shamefully asked himself, "Why am I thinking these thoughts? Am I really that pervert?

But the urges that were running throughout his body were too much for him to control. The desire that had built up in him of wanting and needing his mother to suck him off again and now to fuck his sister was almost more than he could stand.

Okay, then I'll just have to live with the fact that I'm a sick, twisted pervert who wants to fuck every woman in the family. So I might as well be the best pervert I can be, Billy thought. With that, the shame he felt dissipated.

Billy then looked at his father, knowing that his dad would want to discuss what he had seen last night, and went crazy trying to cover every excuse his dad could use as to why he was lapping his own daughter to a climax.

Somehow, he figured he might be able to use it to his advantage without his father knowing his true intentions to get back inside his mother's pants.

Billy made his way to a grassy area, still trying to stretch the stiffness out of his body.

Looking over at his son, Greg signaled to Billy with his hand. "Billy, we need to talk."

"About what, Dad?" he replied, with a faked puzzled look as he headed over to his dad.

"I think you know."

"Are you talking about what I saw you and sis doing in the back seat?"

"Umm, yea. I need to explain."

But Billy cut him off before Greg could finish and said, "If you're worried that I'm going to tell Mom what I saw, you can put your mind at ease. First off, I think sis somehow tricked you, and second, I don't want to see you and Mom split up over this."

"That's exactly what happened!" Greg shouted, breathing a sigh of relief.

"Well, I figured as much, Dad, but Sis must be up to something, and I wouldn't put it past her to open her big mouth and tell mom what you two did. Now that they've gone shopping, she's got all the time in the world to tell mom her side of the story. I would bet it makes you out to be the person who made the advances. Mom isn't going to ever believe you now if you told her what happened. She would want to know why you didn't stop, Sis, or tell her first thing this morning what Steff tried to make you do."

Greg dropped his head down and grumbled, "I think you're right, Son. So, unfortunately, I think I'm still in deep shit."

"Not if we put our heads together, Dad, and somehow make it out that you're not the bad guy here, but the person who was being taken advantage of."

"What do you mean, Son?"

Seeing the intense interest in his father's eyes, Billy put his mischievous plan into action.

"Well, what would happen if I was able to seduce Mom? Then she'd see how it could've happened to you."

Rapidly standing tall and crossing his arms, Greg looked sternly at Billy and said, "What are you saying, Billy? I should condone letting you fuck your mother?"

"No. No. I meant just a little seduction. Not screwing her," Billy replied with a quick chuckle. "I mean, god Dad; she's Mom. How sick would that be?"

Billy then realized that saying that was just as sick as his father licking his daughter and said, "Errr, sorry, Dad; you know what I mean."

"Yeah, I know what you're talking about."

Billy continued explaining his plan to his father and said, "If I can get Mom just interested in the idea and not actually doing anything with her, then maybe she could see how it could happen, and that would give you a good opportunity to tell her what happened to you with sis."

Greg paused for a moment, looked up at the morning sky, and then back at his son.

"It sounds just crazy enough to work, but I don't see your mother getting sexually aroused by her son."

"I could, when we get up at camp, maybe pay mom more attention. You know, compliment her on how pretty she looks and help her with things around camp."

Greg laughed and replied, "That might make her happy, but I don't think that's going to get her interested in having sex with you."

"I'll figure it out, Dad. I have the entire week to try to make something work. I mean, I would rather take a chance at this working than see you two getting a divorce."

Pausing for a moment, Greg hesitantly spoke and croaked, "I might be able to help you with your seduction a little."

"How's that, Dad?"

"Well, your mother is a sucker for having her neck played with."

"What do you mean, Dad?"

"Um... Your mom gets overly excited when I caress and kiss the nape of her neck. It puts her in the mood real quick."

"Oh." Thinking for a bit, Billy said, "I'll try to figure out a way to rub Mom's neck, then."

"Just never let her know I told you about her neck or any of this conversation."

"This is just between us, Dad. I'll never tell anyone."

Billy couldn't believe his luck! Not only was he going to get the opportunity to seduce his mother in front of his dad - he actually told him how to get it started.

Greg thought about what Billy said about Steff. He didn't believe that she would be the one to tell Dawn about them, but he couldn't deny it was a possibility, either.

What am I going to do if she does? What if this stunt didn't work? So many questions.

Billy pushed his dad with his shoulder and said, "Hey, it's going to work out okay, Dad. But, if Sis does, tell Mom, I've got your back. I'll say I saw Steff putting the moves on you while you were sleeping."

"But that is what happened! I was asleep, and I thought it was your mother at first, then it was too late by the time I was fully awake to stop her and... Well... She... Ummm," Greg replied but lost his train of thought when his mind quickly pictured his little girl rubbing her pussy over his cock. His daughter might have started things, but he knew he was more than willing to continue once they did and hung his head low in disgrace.

"We'll even though I didn't see how it all happened, I'll say I did. I believe you, Dad."

Hearing his son say that put his mind at ease, and he said, "Hey, I know you're not old enough to drink yet, but I think on this trip, we'll let that slip. So when your mom gets back, I'll walk over to the store and grab us some beer for up at camp."

"I thought you already had beer in the cooler."

"Yea, enough for me, and maybe one or two for your mother." Greg patted Billy on his back, laughing out loud before pausing when another idea hit him and said, "Listen, I just remembered your mom is a lightweight when it comes to drinking. So we could try and get her a little tipsy. That might make it easier for you two too..." Greg paused mid-sentence.

"I know what you mean, Dad, but don't worry; it's Mom and me. Nothing bad is going to happen, I promise."

Then wickedly thought. I promise not to let Mom beg too long for more of my cock when it's ramming deep inside her pussy!

"Come on, Son. Let's get checked in; that way, all we'll have to do is backpack the stuff to the camping area. But, of course, by the time we get up there and settled in, the sun will be going down."

"Okay, Dad," Billy replied before they headed off to the Check-In Station.

Meanwhile, Dawn and Steff were at the department store in town. Dawn had found a nice bikini, but of course, was waiting on Steff.

The sales lady approached Dawn and said, "Excuse me, Miss."

"It's Mrs." Dawn smiled at the clerk.

"Oh, sorry, I thought you two were sisters. Well, I just wanted to let you know that we're having a big sale on ladies' panties. They're last years' styles, and I have to get them sold so I can put out the ones for next year."

Smiling at the clerk, Dawn said to her, "Thank you for the compliment, but we only need swimsuits today."

Having heard the word 'sale,' Steff quickly exited the dressing area.

"How much are they?" she rushed over, asking.

"Steff, we don't have time for this," her mother replied.

"Mom, it's only going to take a minute to check them out, and if they're really good, they're worth at least a look."

"They're a 'buy one, get one free, and I've already marked them down by half," the clerk replied with a smile.

"Okay, well, take a quick look, but just a look, Steff."

Dawn picked up a pair, and right off the bat, she hesitated. The material was very sheer and would barely cover her ass. Then, taking a closer look, Dawn gasped.

"Steff, these are crotchless panties!"

"Wow! How cool is that, Mom?"

"Steffany Wilson!" Dawn barked, crossing her arms while glaring at her daughter.

"God, Mom, just chill! All I meant by that was, wouldn't they surprise Dad if you wore them tonight at camp?"

"Keep your father out of this, young lady!"

"Okay. I didn't mean anything by it. I just felt that Dad would enjoy seeing you in them, that's all."

Dawn thought over what her daughter said.

"Well, maybe one pair, I mean for some other time. They are at a real nice price."

"Mom, we have to buy two for the sale price."

Dawn looked at her daughter.

"I don't think I want you wearing crotch-less panties yet."

"I don't care about that, Mom. I like the feel of them on my skin," she said, rubbing a pair against her cheek.

"Well, okay, we'll take one pair each," Dawn told the sales clerk.

After paying for the goods, Dawn and Steff headed back to the campground.

Upon arrival, Greg approached the van. Trying to see if Dawn was upset or not when he smiled and said, "Glad you're back, Honey. I was starting to miss you."

"Thank you, dear."

"Me too, Mom," Billy yelled, throwing her a wave and a big smile.

"Thank you, Billy."

"Didn't anyone miss me?" Steff asked, pouting in the front seat of the van.

"Of course we did," Greg replied.

"Now, let's start to get everything ready for the hike. But, first, I need to walk over to the store and pick up some more beer."

"Honey, I think you have enough already."

"I just want to be sure. I wouldn't want to run out up there. It would take me too long to get more."

Dawn rolled her eyes at her husband before saying, "Okay. We'll get the stuff ready.

Greg hurried over the road to the store.

Opening the rear of the van, Billy started emptying the camping gear from it.

"Billy, I'm going to change quickly into some jeans. Can you and your sister keep unpacking?"

"Sure, Mom."

Dawn grabbed a pair of jeans out of her bag and headed to the restroom near the check-in station.

"I'll be only a minute; please don't kill one another while I'm gone."

"We won't," they both replied, and Dawn walked away.

"So, Billy, I was a little shocked when I saw you and Mom in the van last night. How did you manage to pull that off?"

Billy chuckled, "Well, I noticed you and Dad as well. So I could ask you the same thing."

Steff looked around, and once she was sure, nobody could hear whispered, "Listen, big brother, I think if we both play our cards right, we'll both be having sex with our parents again."

Billy smiled at the thought and replied, "You know, sis. I think this is the first time we've agreed on anything."

While loading her backpack, Steff looked up at her brother and snickered, "I think you're right, bro. We'd better not make a habit of this. It would freak Mom and Dad out."

"I think you 're right about that," Billy chuckled.

"Oh! I have to tell you about the panties that Mom bought at the store today," Steff interjected. "Talk about being hot."

"Panties? I thought you went to buy bikinis?" Billy questioned.

"We did, but they had a great deal on these super sexy panties; they're sheer black and very tiny. I mean, they almost cover nothing, but the sexiest thing is...are you ready for this? They're also crotchless."

Billy went over in his mind the description of the panties, picturing his mother wearing them, walking around, watching the way her ass hugged the tight sheer material, making out every curve in her slender ass. Then he pictured his mom lying down on her back, slowly raising her legs in the air and parting her thighs so he could get a good view of her pussy.

Steff then smashed the vivid images that she put in his head when she said, "Hey! You'd better calm that monster down before Mom and Dad get back."

Billy noticed he had a hard-on again and bashfully apologized to Steff.

"There's nothing to be sorry about. In fact, from what I'm seeing, that thing is kind of sexy. So how is it I've never noticed that trophy all these years?"

Billy decided to tell his sister what had happened to him. Explaining how he was bitten on one side of his shaft, and since then having sexual urges for mom, how his once average-sized dick had turned into this monster that was now raring to escape from his pants at a moment's notice.

"Well, I don't know what to say to that, Billy, except I wouldn't look at it as a gift. I mean, what girl wouldn't want to try that thing out? I'll bet Mom thinks about it, now that she's had it in her mouth. I'd go as far as to say she's also wondered what it would be like stretching out her pussy."

"You'd better stop talking about his Steff, or it isn't going to go away by the time they get back."

Smiling at her brother, Steff agreed.

Billy changed the subject and told Steff what he and Dad were talking about while shopping and how he would try to help him seduce Mom.

"I'll try to find a way to help push her into your seduction...