Dean was somewhat breathless and squirming in discomfort, his aching hard-on making driving considerably difficult. The sounds and smell of sex three feet behind him had been driving him wild, even more so because it had involved the two people he was closest to, the most intimate with. He was shocked he had enjoyed it so much and didn't have a clue what to think about that but he did know he didn't want it to stop.

CHAPTER 2

He glanced in his rear view again and saw Sam on his knees behind the brunette, his giant frame hunched over in the confines of the car. What struck him suddenly was that Sam was unzipping his jeans, not doing them up. He watched with bated breath as his brother pulled his jeans and his boxers down to his thighs, releasing his full, hard, ready-to-go-again cock. It hovered inches behind Tasha's still-bare ass, which was extended and inviting, even if she was oblivious to the monster behind it. Sam was staring down at it with hooded eyes, his want clear.

Meanwhile, she was planting kisses around Dean's collarbone, being careful not to obscure his vision as he drove. The atmosphere in the car was heavy with sex and lust and Dean could actually feel the want radiating from his younger sibling behind him. His head was spinning with the dizzying urgency of his own need and he looked up again to catch Sam's questioning, no begging, eyes in the mirror. He gave his younger brother a nod, unable to speak as he granted him permission to fuck his girl.

Sam's look screamed thank-you and, oddly enough, there was no awkwardness in the exchange. Dean's eyes were fixed on the bare ass and the huge cock in the mirror and he watched breathlessly as Sam planted his hands firmly on the girl's slim hips, grinding up behind her and letting his full length slide slowly past her still-wet opening.

Dean felt her hands fist his shirt and the breathy gasp of surprise in his ear just turned him on even more. He could see Sam's hips moving back and forth slowly, teasing and enticing and asking to be let in.

"Please?" Sam addressed the girl in a husky voice, having already received the answer from Dean.

"Oh God," she panted, "Oh fuck." Her gentle nibbles on Dean's neck grew fierce and she bit down hard on his shoulder, unable to answer. "Oh God…..Dean?"

"It's okay," Dean assured her, realizing she was now asking his permission. Somehow he had ended up with all the power and he was fully enjoying the exalting feeling it was giving him. "I want you to," he breathed, his mouth dry in anticipation.

"Oh fuck, yes. Yes!" she cried, instantly bucking back at Sam, begging him to enter her.

Sam didn't need to be told twice. He was rock hard and aching and she was still dripping wet from her orgasm just a minute ago so he simply lined himself up and drove himself hilt-deep with one savage thrust. She cried out in painful pleasure and Dean felt her nails dig into his chest through his t-shirt. Sam didn't work up a rhythm slowly or let her adjust to his size; he simply pulled back out and rammed himself in again and again, wrenching her hips back onto him as he drove forward. She gasped and moaned and clung to Dean even harder, breathing a hot surge of raspy breath onto his neck every time Sam drove himself home.

Dean felt the Impala's bench seat jolt with every one of Sam's thrusts, the pace getting faster and harder and the seatback jerking more and more with each passing second. He was completely hard now and standing at full attention, his sensitive tip slapping the steering wheel every time the seatback jerked him forward. He reached down and palmed his own erection, pumping it with short, hard strokes to match the rhythm of the pair now fucking furiously behind him.

He knew from experience she was approaching another climax. "Oh Dean," she panted in his ear and he fought the urge to close his eyes as he strained to keep the wheel steady. "Dean!" He could feel her chest being slammed roughly against the back of his seat as she was pounded savagely from behind over and over and it was intensely satisfying that she was screaming his name in the pleasure Sam was giving her. "Oh fuck, yes, yes, fuck, Dean!"

Just when the hunter thought it couldn't get any more intense, it did. Sam's hands suddenly appeared, firmly grasping the top of the seat back for better leverage, one on either side of Dean's head. Holy fuck, Dean thought, his shy, awkward, reserved little brother was a total animal! The pounding escalated to an almost frenzied level, Tasha's cries turning into wordless screams of mercy and desperation and the seatback shook as she was completely ravaged against it. Dean had never been so turned on in his life as fingernails raked his chest and screams were panted into his ear in time with the frantic slapping sound of his brother going balls deep in his girl. Sam was grunting loudly and Dean was jerking himself off madly when he decided suddenly he needed more.

With a sharp tug he yanked the Impala's wheel to the right, careening less than gracefully onto the gravel shoulder and skidding to a halt. He didn't turn to see what was going on in the back seat but merely jumped out of the car and swung open the door on the back driver's side.

Sam had pulled out of her and fallen back with the swerving of the vehicle and was now sitting in the middle of the back seat with his jeans down at his thighs and his slick cock still standing impressively erect in his lap. She had turned around but in the awkwardness of the confined space and the careening car, was now essentially straddling the younger hunter, though she was pushed back against the front seat, her dripping heat hovering inches over his knees.

They were both looking at Dean with fear and shame as he yanked the back door open.

"I'm sorry, Dean," Sam panted.

"We thought you were okay with it," she whispered breathlessly, trying to slide off Sam's legs.

"Woah," Dean ordered sharply, holding up his palm in a gesture to stop. "Don't move," he said, more softly but still in a commanding tone. They both froze. "I am okay with it," he assured them. "What I'm not okay with is missing out on all the fun."

He got an instant grin from Tasha and a wary, questioning look from his brother as he pulled his jeans and boxers completely off, tossing them on the floor before ducking his head and climbing into the back seat with them. He slammed the car door shut behind him and gave them a lusty grin.

Although the Impala was a roomy car, it was still tight quarters for two large men and a girl to maneuver around in. Not wanting to kill the moment, Dean told her to ride Sam while he got himself in position. She obeyed without questioning and Sam, although he had a surprised look on his face, didn't argue. Dean felt the heat spreading from his cock into his stomach as he ordered them to fuck from where he was squatted half on and half off the seat next to them and watched them scramble to obey.

She pulled herself farther up on Sam, still straddling him, and lowered herself gently onto his twitching erection, tipping her head back and moaning as she did so. She started to rock back and forth and Sam seemed to instantly forget any awkwardness of having his brother half naked and totally up in his personal space for he grabbed the girl's slim hips and pulled her harder onto him. She clasped the younger hunter's broad shoulders and they began to pick up the pace but were stopped by Dean, who was clumsily trying to squeeze in between Sam's knees and the front seat.

"Slow it down," he told them. "Don't want you two finishing before I join the party."

They struggled to restrain themselves, her hips curling forward and backwards on Sam's lap so slowly his fingers dug into the flesh of her thigh with the delicious frustration of the unhurried pace. Dean somehow managed to wedge himself in behind her, on his knees on the floor and facing Sam with her body in between them, being careful to make as little contact with his brother as possible.

"Okay, that's enough," he commanded, gently pulling her back towards him by the waist, his cock twitching at the wet, sucking sound of Sam popping out of her. Sam let out a groan but made no move to pull her back and Dean reveled in the feeling of complete control he had over both of them. This was his party now.

Sam desperately wanted her back on top of him and was thinking Dean should just let him finish first and then he could have the girl to himself. He wasn't entirely sure what Dean had planned or if he was completely comfortable with his big brother actually joining in. He'd never had a threesome, even with two girls, and saw no advantage of having another guy in the mix, especially his brother. He had admittedly found it exhilarating knowing Dean was watching a few moments ago but Sam didn't want to just watch, he wanted to fuck.

He was suddenly far more accepting of watching when Dean's hands slipped around the brunette's waist from behind and glided slowly up her curvy body, sliding her blouse up with it. With catlike grace, she arched back into Dean and reached her arms back over her head to run them fondly through his short, spiky hair. Dean kissed her neck from behind and she moaned when he cupped her breasts, sliding his hands into her bra and pinching her nipples.

Sam resisted touching himself as he didn't want to cum just yet. He wanted to last until the tantalizing show was over and Dean let Tasha ride him out. He was still rock hard and felt himself twitch when Dean started unbuttoning her blouse. The elder Winchester pulled it off her shoulders and tossed it aside, moving in quickly to remove the obstructive fabric of her bra, all the while planting kisses along her shoulder and neck. Sam was moved by the intimacy of it and suddenly felt privileged to be able to witness them together in such a private moment. It was almost as if they'd forgotten he was there, watching them and breathing heavily with unattended lust.

She too was breathing heavily as Dean massaged her breasts in his rough, hunter's hands and her hips were rocking back and forth on Sam's knees with sensual rhythm, her legs spread apart enough for Sam to see how wet she still was. She was entirely naked now and her body was glistening with sweat in the steamy heat of the car.

"Lean forward, Tash," Dean finally whispered in her ear, pushing her chest forward from behind. She did as he asked, leaning over Sam, her face close to his and her hair tickling his exposed chest. She braced her hands on the back of the seat on either side of Sam's head, her breath hot on his cheek. Sam turned his head towards her, eyes hooding as he tipped his mouth towards hers but she turned away just as their lips grazed, moving out of his reach. Sam didn't have time to feel awkward about the slight as she covered by moving in closer to his ear and brushing her lower lip lightly across his lobe. Her hips were pulled upwards by Dean and Sam finally clued in on what his brother's plan was when she gasped and her whole body tensed.

That was Dean's first finger sliding inside, working her tighter hole. She let out a pained whimper in Sam's ear and her belly scraped against the tip of his neglected erection, sending an enticing spasm right up into his abdomen. Dean stilled for a moment, letting her adjust before starting to slide the finger in and out slowly. Sam could feel her body gradually relax and she started to push back onto Dean's finger, asking for more. That was when he inserted the second one.

She cried out softly, her hands moving to grip Sam's shoulders and her back arching upwards. Sam's hands involuntarily swept upwards to squeeze her breasts, pinching the nipples between his thumb and forefingers. He leaned forward and took one of them into his mouth, suckling the nipple for a moment before tugging at it gently in his teeth. She moaned and began to rock her hips slowly onto Dean's fingers while reaching down and wrapping her fingers around Sam's erection, pulling gently and eliciting a pleased hissing sound out of him.

"Just give me a minute to work her open, Sam," Dean warned with a chuckle, scissoring his buried fingers.

"I'm ready now," she pleaded, thrusting backwards. "God, I want you inside me." Her voice was laden with need and she fisted Sam's shirt again. "Both of you."

Dean laughed. "Always so impatient," he said teasingly, inserting a third finger and groaning with pleasure at her delighted squeal. A few strokes later he pulled them out and gave her ass a slap as he pushed her hips towards Sam's straining cock. "Okay, get on him," he ordered, his voice husky.

She raised herself up, positioning her opening over Sam and preparing to slide on gently but the younger hunter ran out of patience and grabbed her waist, pulling her down with one quick motion. Her thrilled gasp got another chuckle out of Dean, who was guiding his own hard cock towards her. He placed his hands on her hips just below Sam's and together they pushed her up and down on Sam a few times, Dean's strong grip setting the slow and steady pace. He finally removed one of his hands and used it to position his tip at her free opening. As he pulled her up from Sam, he pushed himself into her with a hard thrust, groaning with pained delight at her tightness.

Sam gasped when his brother entered her because he felt her clench and tighten around him as she glided up his shaft. Two pairs of hands stopped her just short of the tip and pushed her back down to take in Sam's full length as Dean pulled out. As they lifted her off Sam, they pushed her back onto Dean. They rocked her back and forth with increasing speed, fucking her onto Dean then onto Sam then back onto Dean. Sam. Dean. Sam. Dean. Sam. Dean. Sam Dean Sam Dean SamDean SamDean... They speared her faster and faster, sinking deeper and deeper with every plunge. Barely able to get a breath in, she gasped and panted, her frantic cry from one penetration being cut off by the desperate cry from the next. The brothers were relentless, passing her body back and forth like a ragdoll, pulling her harder and harder onto their cocks as their tempo increased. She was practically screaming from the double-sided assault and Dean knew she was close when she raised her arms and planted her elbows on the Impala's roof, pounding it with her fists.

Her orgasm came suddenly and she began twitching with spasms that rocked her whole body. Sam felt warm spurts of wetness caress his cock as she slid up its length and he slowed, allowing her to savor the moment.

"No," Dean panted from behind her, his teeth clenched in effort. "Fuck her through it, Sam. Fuck her through it!"

Sam obeyed without thinking, thrusting himself upwards and back inside her and he felt his brother doing the same. He let out an involuntary cry of pleasure as her juices trickled down across his balls and he pumped faster and harder, excited beyond belief at the sound of her wails and screams at the ruthless assault. His balls were smacking against her skin as he thrust his hips upwards and he could hear the wet slapping sound of Dean's doing the same from behind. They continued pounding into her harder and harder and their rhythm gradually shifted so they were both entering her at the same time. She would suck in a gasp of air as they pulled out and cry out every time they thrust back inside. Sam could feel the presence of his brother inside her every time he sank his own cock hilt deep and every twitch and spasm of her battered muscles just made him want to fuck her harder. They thrust themselves in with perfect unison, her breathless cries of "uhh! uhh! uhh!" just inciting them further as they continued the brutal onslaught. Rough hands pulled at her hungrily from both sides and she gave herself over to them freely, letting them maneuver her body however they saw fit for their pleasure.

It wasn't long after she finished her second orgasm that she fell into her third. She had no screams left in her and she fisted her hands in the fabric of Sam's open shirt as she struggled for breath and arched her back, her thighs clamping tightly on either side of the hunter beneath her as she spilled yet more juices down his still-thrusting cock.

She had barely finished cumming, small spasms still quivering down her legs, when Sam felt himself following suit and he slipped out of her, pumping himself fiercely to finish off. A loud cry of immense pleasure and intense satisfaction escaped his lips as he exploded, spurting onto his own stomach until he was completely empty and flaccid. He rolled his head on the seat back and closed his eyes, panting harshly as he recovered, only vaguely aware that she and Dean were still fucking on top of him.

Dean had pushed her back down so she was again leaning over Sam and pulled her hips farther upwards. The elder brother had shifted his own hips higher so he was directly behind her raised ass and was now pounding into her from behind, no longer needing to keep her in position for Sam also. Having had a later start, Dean was still rock hard and the intensity of both her orgasms and Sam's had turned him on unlike ever before. He let out a loud, almost primal cry as his balls slapped hard against her skin and his cock rammed repeatedly into her tight ass. Her hands were clenched in Sam's shirt collar and her head was buried in his neck and watching her cling to his little brother for dear life as he fucked her was driving Dean wild. He could feel her legs trembling and her whole body was quivering but it was her sudden pleading cry of his name that finally sent him over the edge. He pushed himself all the way inside and exploded, digging his fingernails into her bruised hips and shaking as he too cried out in release.

Her body collapsed down onto Sam's, still clasping his shoulders as she panted, shuddering and spent. Dean pressed down on top of her, still inside her pulsating heat, his own chest heaving from the exertion. He laid his head on her back and gently stroked her splayed thighs with his fingertips. Sam had his eyes closed and was acutely aware of the pressure of the two heaving bodies on top of him. They all lay there in silence for a moment, catching their breath and relishing in the complete and utter satisfaction they had achieved.

It was Dean who spoke first.

"Happy birthday, Dude," he drawled, not looking at Sam directly.

Sam laughed as much as the pressure on his chest would allow him. "Yeah, thanks for that," he answered, starting to feel awkward. "Uh, maybe I should drive," he suggested. "We still gotta get to Phoenix."

"Yeah, you're right," Dean agreed, straightening up and pulling slowly out of her. She whimpered in Sam's ear at the withdrawal and Dean clumsily tried to scoot out from his cramped position on the floor. He had removed both shirts sometime during the fucking and was now completely naked, as was she. He dropped himself on the seat next to Sam on the passenger side and pulled the limp and sated girl off Sam's chest, cradling her in his own lap.

Now free, Sam raised his hips enough to pull his jeans and boxers back up and moved to slide out of the crowded back seat. He couldn't help but smile as he noticed she had twisted around so she was facing Dean and her hand was stroking his cheek softly. He opened the door and crawled out, wincing at the cramps in his legs but not surprised at how wobbly they were. He peered back inside to see his brother slide both hands into her hair and pull her into a deep kiss. He watched them kissing passionately for a few seconds, both naked and completely oblivious to his presence. He found it very touching and was moved to see his brother so tender and open.

The distinction between making love and fucking suddenly became very clear to him and he realized he had only been invited to a fuck but that there was so much more than that to their relationship. His mind flashed on the fact that she hadn't allowed him to kiss her and a sharp jolt of pity struck him when he suddenly became acutely aware of the fact that she and Dean were in love.

In love. As much as they both played this off like it was some casual thing, they were in love. With just over three weeks to go before Dean's deal was up. How was that for ironic? The Winchester curse at its finest.

Sam watched them for a few more seconds, the cool night breeze caressing the sticky wet smear on the exposed flesh of his abdomen and giving him goosebumps. He felt a slight twitch of arousal in his pants as he watched them press against each other's naked bodies, writhing slowly as they kissed. Abashed, he zipped them up quickly and hopped into the front seat, starting up the engine and yanking the Impala back onto the road.

He listened to the pair kissing and murmuring to each other for the next twenty miles before silence fell over the car. He glanced in the rear view mirror and found them both asleep, entwined bodies sprawled buck naked on the leather seat. He chuckled to himself as he sped along, thinking his brother would never let him live it down if they happened to get pulled over by the state police at this inopportune moment.

/\\/\\/\\-/\\/\\/\\-/\\/\\/\\-/\\/\\/\\-/\\/\\/\\

A/N: How was that for an opener? There will be more sex later in this story but I promise there will be a real hunt also, starting next chapter. I know that I promised Cas some smutty-fun also so I will write a separate one-shot for him soon, I promise! *lol*.

Reviews are cherished (even anonymous ones) and constructive criticism will always be appreciated. This is my first ever full story so I could use all the help I can get!