A tight knit family

"Well, if you're sure," Brandon relented, closing the trunk and opening the door to the back seat.

Opening up the sleeping bag, Brandon spread it over the seats and then, after kicking off his shoes and throwing them over to the drivers seat, he crawled in on to the bag. Meanwhile, Madison locked her car and began unzipping her hoodie.

"Uh, what are you doing?" Brandon asked.

"It's too bulky. I'll fit better if I take this off," she said, slipping the hoodie off her shoulders. Brandon couldn't deny her logic, but as she removed the hoodie, Brandon saw that she was only wearing a black bra underneath. He tried not to stare at his sister's firm tits, encased in the bra, which pushed them together and created significant cleavage. Chloe came to mind, and how fantastic her large tits were exposed when she lost her bikini top. The thought crossed his mind of how Madison would look if she were to somehow lose her bra.

No, no, bad thoughts, he shouldn't think like that about his sister. Especially not a sister that was currently closing the car door and crawling up in beside him in a sleeping bag. Certainly not a sister whom he was zipping in to that sleeping bag with him. Not a sister who had to scoot right back against him in order to fit in the sleeping bag with her brother.

A warmth came over Brandon as he felt his sister's bare skin pressed tightly against him. Every inch of her body was next to him. He could taste the soap on her neck every time he breathed. His arms were wrapped around her torso, hands clasped beneath her bra, because they had nowhere else to go. Her firm, round ass, pressed against his crotch, a growing hardness in his shorts growing against the pressure. Her hot little feet in her cotton socks warmed his toes.

Madison exhaled sharply, blowing air up over her face, which Brandon felt on his own. Her hands fell on his, keeping them wrapped around her body as she shifted and shuffled, grinding her body back into her brother.

"Shit, this is tighter than I expected," she admitted. "And really hot."

"I know, sis," Brandon agreed. "I'm burning up here."

"You can take off some clothes if you need to," Madison suggested. "I won't mind."

"A-are you sure?" he asked, noting that he was already feeling somewhat aroused from the current level of friction. He worried what actual skin to skin contact would be like.

"If you're going to be restless and too warm to sleep, you'll end up keeping me up all night too," Madison reasoned. "And then this whole exercise will have been pointless."

Again, Brandon couldn't fault her logic. But he still felt uneasy as he reached down and grabbed the bottom of his tee-shirt, his hands grazing his sister's thighs as he did so. He lifted the top but it snagged between their bodies. The siblings pulled their torsos apart to allow the tee-shirt to travel up, but in doing so Madison bent over slightly, pressing her shapely buttocks right against Brandon's hardening cock.

He flung the tee-shirt on to the floor, and then reached down again. His hands roamed over Madison's body as they went, rubbing against her shoulders, her arms, her waist, her hips and around to her ass, as he gripped his shorts and pushed them down. The shorts had the same problem as the top, so again the siblings had to manoeuvre, the flesh of his sister's back making contact with the toned, athletic, physique of Brandon's chest. With a gap created between their bottoms, Brandon was able to push his shorts down, and shuffled his legs to work them down and off his feet.

The gap between their crotches also allowed the cock in Brandon's tended boxers room to move out, rising until it stuck straight out. Brandon knew that as soon as his sister moved to place her ass against him, she'd feel his stiff, hard cock.

"Hold on," she said, postponing Brandon's embarrassment, as she reached down to her own shorts. "Better take these off now, rather than have to do this all again later."

Brandon swallowed hard as his sister pushed her shorts down over her ass and worked them off in much the same way that her brother had. Then, without warning, she slammed her ass back against him, snuggling back into their previous embrace. Except this time there was a thinly clothed, hard cock wedged between her butt cheeks.

"Bra-Brandon, what...what is that?" She looked over her shoulder but it was too tight and dark to see between their bodies. Instead, she looked at his face, flush and red. "Is...is that your dick?"

"Shit, Mads, I'm sorry," He closed his eyes and hung his head, leaning against her shoulder. "It's just this tight space, and this heat..."

"It's alright, it's natural," she said, casually. "We'll just have to make it go down."

Sweat formed on Brandon's forehead. He'd heard that kind of line before in porn, but his sister couldn't possibly mean what they meant. But, now his mind was filled with images of women jerking and blowing cocks to 'make them go down.'

"You were pretty angry earlier," Madison said, pulling Brandon out of his lewd imagination. "Tell me about that."

"Oh, that," Brandon sighed. "I found out that Ashley was cheating on me, with Zack."

"What?" Brandon felt Madison clench her fists beneath the sleeping bag. "I'm gonna kill that little bitch."

"I already punched Zack a few times, and then stormed out," Brandon relayed. "That's how I wound up out here in the middle of the night and had to call you."

"Well, at least it worked out into a happy ending," she said, snuggling back against him, her buttocks grinding against his cock. And the words 'happy ending' sent Brandon's mind into another barrage of pornographic memories.

"Ah, Mads, that's...uh...not helping it...umm, go down..." he said, gently placing his hands on her hips to make her stop. His fingers made contact with her panties and his body grew hotter, realising he was touching such an intimate piece of clothing that belonged to his sister.

"Ah, sorry," she giggled. "I know you really liked Ashley, so I'm sorry things didn't work out. But if she thought so little of you that she could cheat on you, she doesn't deserve you, Bran."

"I know, but it still hurts, and it basically came out of nowhere," he continued. "Or at least, it felt like it did. I wonder if there was something I missed or something I should have done."

"No, Brandon, don't do that to yourself. The only person to blame here is Ashley, that slut." Madison admonished her brother, twisting in the spot to look back at him as she told him off. In doing so, her ass continued wiggle his cock.

"I know. And they lied about it, rather than just coming out with it and telling me to my face what they'd done. The only reason I found out was because I used a snooper app and hijacked Ashley's phone. I watched them sneak off to dinner and then go to a hotel afterwards. That's why I got so angry. Seeing them out, having the time of their lives, while I was left in my ignorance, just made me so furious."

"I know. I felt it. I was just washing dishes when I got this sudden anger welling up inside me. I had no idea who I was upset with or why, I just wanted to punch something. It was like a burning sensation in my heart, and it just kept coming in waves. I figured it had to be you."

"Shit, sorry, Mads," Brandon said, burying his head in her shoulder again.

"No, don't ever be sorry about it, Bran. It's part of who we are, of how connected we are. Not every one gets to say that there's someone in the world who feels exactly how they feel. Just think, we can share in sadness and anger and even happiness in a way that others can't. They can think they feel the same way, but we know."

Brandon chuckled. "Yeah, that's true, I never looked at it like that before."

Silence fell in the car, the only sound coming from the rustling of trees in the wind outside. But looking down over her shoulder, Brandon could see Madison biting her lip, and he could tell there was something she wanted to say. But looking further down, Brandon could also see Madison's deep cleavage, which made his cock twitch against her buttocks.

"Hm, still not gone down yet, huh?" Madison giggled. And then after a paused, she started to speak, an apprehensive tone forming in her voice. "Brandon, did you watch them?"

"What them who?" Brandon asked, obliviously.

"Zack and Ashley," Madison answered, her voice growing more nervous as she explained. "When I called, you were angry, but then there was another emotion that overwhelmed it. At first, I was angry, but then I started to get...aroused. Were...were you watching Zack and Ashley fuck?"

"I...I did. And watching their love making, the way their bodies slapped together and how he made her gasp, it got me hard. I hated that it made me horny but it was just like watching porn." Brandon thought about lying but decided there was no point. She already knew what he had been feeling anyway. "That's when you called."

"Did you jerk off while watching them? While I was on the phone with you?"

"...yes."

The weight of the statement hung in the air. Brandon felt hotter than before, and his cock throbbing between his sister's ass cheeks. Looking down again, he saw beads of sweat running over the swell of his sister's tits and down between her cleavage.

"...I was touching myself too."

"Huh?" Brandon looked up from Madison's breasts and saw her face, flush and dazed.

"I could hear you grunting down the phone, sounding breathless and distracted. And I was getting wet, really wet, like soaking my panties and running down my legs wet. It was practically drooling in its need, and I had to do something, anything, to sate the desire. So I started touching myself...while I was on the phone with you."

"M-Mads..." he said, not sure how to respond. In his mind he replayed the events of his sister's phone call. He'd been quite preoccupied with getting himself off to his ex-girlfriend cheating in a hotel room with his friend at the time. But, now that he thought back to it, he could remember Madison's voice sounding almost like a moan at times. And then at the end....there was that scream. The scream he'd thought was Ashley cumming. "...did you cum while on the phone with me?"

Madison bit her lip and nodded lightly. "I didn't know if you'd heard or not. I was trying to hang up but I didn't do it in time, and the orgasm just took over. I had to wait until it past before I could do anything. You didn't say anything after I hung up, so I didn't think you'd noticed..."

"I didn't, or I mean, I thought it was Ashley but, it sounded different," Brandon explained, as he thought about the events earlier that night. "That means...we came at the same time?"

"What? Really?" Madison asked, almost sounding happy at the idea. "We came together?"

"Near enough," Brandon said. "I was cumming at the time so that's why I wasn't clear who the orgasm was coming from."

"Wow, that's so hot," Madison thought aloud. "I knew we were intune but I never thought that we could be so aroused together that we could actually climax at the same time..."

Another pause in the conversation followed. It was quite neat how their twin body chemistry seemed to work but to call it hot? Did Madison find it arousing that she got off along with her brother? he wondered. That was something that most people would have been disgusted by, but Madison just seemed curious. More than that she sounded pleased.

Brandon's cock wasn't going down. If anything, it was harder and stiffer than it had been before, which he hadn't thought possible. He couldn't tell if it was the ass his cock was wedged in, the idea of getting off with his sister, the fact they could sense each other's arousal or if it was actually Madison's arousal that was making him hard.

And he knew Madison was horny too. For one, her breathing had become ragged and strained. Also, he could feel the wetness forming on her panties against his balls. Finally, when he looked down, forcing himself to look past her bountiful cleavage, he could see something moving beneath the bag. In the sleeping bag, her arms rubbed back and forth against his own, as her hand rubbed the crotch of her panties.

"It makes me think that maybe we should fuck," Madison broke the silence again, but with words that stunned Brandon and left him speechless.

Though his mind couldn't form a response, his cock did, jumping at the thought of sex with his twin sister. Madison giggled as she felt it tug at her panties, trying to press itself into her asshole.

"I see someone likes that idea," Madison teased, grinding her ass back against his cock once again. "I know it sounds weird, but listen to me. We share in each others arousal and orgasms. When one of us emotes, the other feels it. Imagine how amplified sex would be, feeling something and having the other person feel it too. Not something like it, not their own pleasure, but actually feeling your emotions. And imagine them cumming, and not just knowing that it's happening but actually experiencing it and knowing that they're experiencing your orgasm too. Think about it, Bran. Together, we might be able to have a fuller experience of sex with each other than anyone else in the world."

That did sound amazing, but Brandon couldn't quite overcome the I word.

"It's still ****," he said, and Madison scoffed, pushing her ass back against her brother's cock harder.

"Think of it as a science experience," she whispered, leaning back against his strong, muscular chest. "A study in how twins experience sex."

His body duelled with the dilemma. On the one hand, it was wrong. He'd been told his whole life that **** was depraved, performed only by backwards, stupid people who were no better than animals. If he gave in, wouldn't he be just like them? Like an animal, giving in to baser desires with a family member? It would be a defilement of the family unit, a perversion of family love. His mind replayed the names in his head, branding himself over and over as a deviant, as a pervert.

Yet, he couldn't deny that his body wanted sex. His cock was hard and it didn't seem to be going anywhere any time soon. How could he ever sleep unless he got rid of his hard cock prodding his sister? And it's not like her suggestion wasn't intriguing. He'd had sex with Ashley and it'd been great. But could sex with his own sister, his own twin, who could sense and know his feelings as well as he could, be that much better? And was he willing to cross the line to find out?