Carla was sitting in the kitchen drinking coffee and having a bowl of cereal when her mother came into the room. Emily poured a cup of coffee and added milk, then sat down at the table across from Carla. She looked at her daughter, and Carla looked back and smirked.
"What is it, Mom? You're looking at me all weird."
"Are you sure everything is okay, Carla? I was a little concerned last night. You were acting a bit odd."
"Mom. I told you. Everything is just fine, okay?"
Emily stared at her daughter a bit longer, then shook her head. "Fine. I'm here if you need me," she said.
The women sat there in silence, sipping on coffee and drifting off into their thoughts. Carla was actually smiling as she recounted in her mind the events of the previous night. Emily was fairly certain that Carla and Billy were lying to her, and fairly certain why. As a mother, this was an issue that she needed to deal with. As a woman, thinking about Billy having sex made her blush and recall the thoughts she had last evening as she masturbated in the tub.
As if on cue, Billy walked into the room wearing only a bathing suit.
"Good morning," he mumbled as he scratched his head and stretched. Both women watched him move about the kitchen. Billy caught Emily's eye and she quickly looked away, fearing that he would see her thoughts by the expression on her face. She got up and walked over to the fridge.
"Would you like some bacon and eggs, Billy," she asked.
"Sure, mom. That would be great," he replied.
Billy poured himself some coffee and sat at the table next to Carla. Emily watched the two of them as she cooked, and she could see the glances they were aiming at each other. She had a mix of emotions running through her at that moment, but the one that was the strongest was jealousy. She was jealous that her daughter might well be fucking her stepson. She turned the bacon over, and admonished herself, thinking she had better get herself together. She was going to have to deal with what was going on between these two kids, and deal with it quickly before it got out of hand. John would flip if he knew what the kids were up to.
John had left early that morning for a business trip that would last a month. She had a little time to figure out what she would do, but she was clueless about how to handle this. Should she approach them and tell them what she suspected? Should she just try to keep them apart? How would she do that? It would be difficult enough during the day, when she was supposed to be working from home. What would she do during the night? With the kids sharing a bedroom, how could she keep them away from each other?
After breakfast, Billy headed off to the lake to go fishing, and Carla grabbed a book and headed for the hammock in the back yard. Emily had a brainstorm and called her friend Brenda, asking if she'd like to come spend a few days up in the mountains. Brenda had twin sons, Jason and James. They were twenty one, and Carla had always had a huge crush on both of them. Brenda accepted the offer, and several hours later she and the boys pulled up to the house, anxious to get outside and enjoy themselves. When Carla saw the boys, she ran over to greet them, squealing and excited. A short time later, Billy came back from the lake, and the four of them headed off into the trails to hike.
Emily was quite pleased with herself. The kids wouldn't be alone, and Carla would have two boys to pay attention to. The twins were tall, strong, and handsome. It was just the thing Carla needed. If she was wrong about Carla and Billy, it would just be a fun week for all of them. Forgetting about work, Emily and Brenda sat on the porch sipping wine and catching up.
The four kids enjoyed their hike, talking and kidding and teasing. Carla was very happy to see Jason and James, but she spent a lot of time thinking about Billy. She watched him as they walked, and all she could think about was the next time she would feel his hands on her skin. She realized that she would not have an opportunity to feel his incredible cock inside her again while they had visitors, and she became angry at her mother.
As the week went on, Carla became more and more needy. On top of that, she started to worry that Billy had enjoyed his fun and would now move on. They really didn't have any opportunity to discuss what had happened, and he seemed to be having a grand time with Jason and James. He was paying little attention to her, adding to her insecure feelings.
On Thursday morning, Jason and James slept in, but Billy got up early to go for a run. Carla was awake too, making coffee and pouting. She sat in the kitchen with Emily and Brenda, and they all watched Billy walk out of the house.
"He's really grown up," Brenda said to Emily.
"He has at that," said Emily. She was blushing at the thought. "All of the kids have. In just a few short years, they will all be out on their own." She pictured Billy lying there half naked in his bed and felt her cunt throb. She blushed again, and got up to pour herself a cup of coffee. She opened the fridge and saw they were out of milk.
"Dammit. We have no milk." Emily turned to Carla. "Can you go to the store and pick up some milk, hon?"
Carla frowned, but got up anyway. She wouldn't drink coffee without milk, and she needed coffee. She was up most of the night fretting over Billy, and she was dead tired. "Sure mom," she said grabbing the car keys off of the counter. "I'll be back in a while." Carla climbed into the big SUV and pulled out of the driveway. She was about a half mile down the road sitting at a traffic light when she saw Billy jogging around a bend in the road. He saw the SUV there, and he broke into a huge smile and waved at her. When the light changed, Carla pulled over to the side of the road and waited for Billy. He came up to her side of the vehicle and crouched down, looking in at her.
"Hey, Sis," he said. "Where you going?"
"Down to the store to get milk. We're out."
"You want company," he asked her.
Carla flashed her best smile at him. "I'd love it, Billy. Hop in."
Billy jogged around the other side and jumped in. He looked at Carla and smiled, and she started driving down the road. They hadn't gone very far before they approached a scenic overlook on the right.
"Pull into there," exclaimed Billy, as he pointed to the sign. Carla's heart leapt in her chest as she gave him a quick glance and smiled. She made a hard right and pulled in fast, seemingly on only two wheels. "Nice turn, sis," Billy teasingly said. The parking lot was deserted, and Carla pulled the SUV far back under a stand of trees.
She put the car into park and turned to face Billy. His mouth was upon hers in an instant. Their tongues danced together as Billy reached under his sister's t-shirt and fondled one of her tits. Carla moaned into his mouth as they kissed. She broke free and looked at Billy.
"I wasn't sure you wanted to continue this with me," she said.
"You don't have to worry about that. I've been thinking about it all week."
"I was so worried," she sighed. "We don't have a lot of time, Billy. Let's get into the back. I need to have your cock inside me again."
They flipped the back seat down, and Carla climbed in, followed by Billy. Carla was lying on her back on the floor, pulling her shorts and panties off. She was throbbing and drenched already, and she waited impatiently for Billy to slip his shorts off. He knelt between her legs, and she reached down and grabbed his rock hard cock. She was rubbing it on her pussy and whimpering.
"What is it that you want, sis," Billy teased.
She looked up at his smiling face. "I want you to fuck me, Billy. I need you to fuck me. Please."
"I was right the other night. You really ARE my slut Carla. Isn't that right?"
She locked her eyes on his and licked her lips. "I am, Billy. I am your slut. Does that excite you? Are you happy that your sister is your slut, Billy? Look at me, all ready to take your giant cock inside me. It's all I can think about. Your cock inside me. Are you going to fuck your slut sister now, Billy? Please?"
Billy grinned and guided the head of his cock inside his sister's dripping cunt. Carla gasped when he penetrated her, and they both looked down and watched as his long fat cock disappeared inside her, inch by inch. By the time he was fully inside her, she had already cum and was clinging to him. Billy started a slow, rhythmic movement, fucking her as he kissed her mouth and neck and tits. Before long, Billy picked up the pace and started to pound Carla. She was very vocal as he fucked her, and an overly excited Billy bit her neck as he came inside his sister, filling her cunt with a load of his cum.
He stayed inside her for a little longer, kissing her gently and petting her hair. They put their shorts back on and got into the front seat, making the short drive to the store to pick up the milk. They arrived back at the cabin and went inside, where Emily was shocked to see the two of them together.
"I thought you were out jogging, Billy."
"I was, mom. I ended up down near the general store and saw Carla in the parking lot. I got lazy and hitched a ride with her. It's really hot outside and I needed some relief," he said, glancing at his sister.
Carla rolled her eyes and shook her head at his remark. "Here's the milk, mom," she said handing her mother the bag.
"What happened to your neck, Carla? There is a bruise on it!"
"I...I don't know. Maybe something bit me I guess." Carla went into the bathroom and examined the mark that Billy had left on her neck. It made her smile inside. He had marked her, and she liked it. "I'll spray some Benadryl on it. It's a bad one."
Emily looked at Billy, who shrugged and shuffled out of the room. She was now certain that the two of them were fucking each other, and that thought was solidified when she went out to the car later and saw that the middle seats had been folded down, creating what was essentially a bed in the back of the SUV. Dammit, she thought. She was going to have to talk to them. In the middle of all this, she was still struggling with her own thoughts about Billy. It seems that once she had opened that Pandora 's Box, she could no longer close it. She had masturbated several more times over the past few days, her thoughts drifting to her stepson as she did so. The more horrified she became about it, the more it excited her. She needed to get control of this entire situation.
