This is another repost, one of my favorite submissions. I should have a Pt 2 out for this soon.

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Jack bolted awake as he heard the sound of someone screaming his name and heat piercing his flesh. He looked over to the left to see his sister, Kelsey, glaring at him with pleading eyes as she struggled with her seat belt to get free. Panting with fear she cried out,

“Jack! Help me! I can’t get loose!”

Quickly unbuckling his seat belt, Jack darted over to his sister and whipped out his Swiss army knife, cutting her free from her restraints. As his sister crawled out of a hole in the fuselage of the burning aircraft to safety, Jack bravely went forward to check the cockpit only to see the pilot slumped over the control panel. He checked his pulse in vain as he heard his sister cry out,

“Jack! Get out there! I think it’s gonna blow!”

When Jack darted out of the hole in aircraft and landed on the hot sand below he rolled his ankle, the pain of his fall darting through his thigh. Kelsey cried out as she helped him to his feet,

“Come on Jack we gotta get away from here!”

As the siblings ran off into the tree line they heard a massive explosion behind them as the fire reached the aircrafts fuel tanks. As they lay next to each other in safety of the jungle, the siblings looked at each other in the eyes as Kelsey said in a worried tone,

“Oh god Jack… what are we gonna do now???”

Two weeks before the crash, in celebration of Jack graduating from college, their parents decided to take the whole family to Fiji. Jack and Kelsey quickly grew bored of their tourist packed resort and upon seeing an ad for airplane tours to the surrounding islands; they decided to go to an island that had less tourists for a day and spend some time together. They had always been close growing up and the separation caused by Jack going away to school was hard on both of them. They knew their parents wouldn’t approve so they never informed them of their plans, in fact they didn’t tell anyone except the pilot where they were going.

Little to their knowledge, two unfortunate things happened that would change their lives forever. First, the pilot had been drinking heavily the night before and in his hangover state he forgot to do what he done every day before he took passengers on a flight and file his flight path with the control tower. Second, the mechanic on duty that morning was new on the job and had overlooked a leak in one of the fuel lines. The result was that both siblings now faced a burning aircraft on a tiny island in the pacific

“Jack!” Kelsey shouted out, breaking her brother’s focus on the aircraft. Having his full attention she continued, “What the hell are we gonna do? We never told anyone where we were going! Is anyone gonna come looking for us?!”
As she started to tear up, Jack held his sister close and replied softly, “Don’t worry sis, pilots always register their flight paths, they will notice he’s missing and come looking for us.”

The siblings took their time to establish themselves on the island and make distress signals using fires and forming SOS in the sand. Luckily for them the fire on the aircraft burned out quickly as it was already low on fuel so their baggage had been left intact, protected by the thick baggage compartment. They had a supply of razors, soap, and even matches so their stay on the island wasn’t too bad, though all the clothes they had was swim wear. After some exploring they found a water source and fruit trees to subsist on. However as days turned into weeks and weeks into a month they both began to lose hope of rescue.

Though Kelsey was his sister, Jack couldn’t help but notice how hot she looked in her bikinis. He always had a little crush on his sister but the past few weeks alone with her on the island had made it worse. As she walked down the beach swinging a small piece of driftwood around he couldn’t help but check her out. His eyes traveled up her long toned and athletic legs up to her well formed ass, flat toned stomach, and shapely hips. Her 34 C breasts looked amazing in her bikini, but her best feature was her face, she was absolutely stunning with sparkling blue eyes and long natural blonde hair that framed her face perfectly. He kept reminding himself that this was his sister but for the past few days all he could think and dream about was his hot sister riding his hard cock. But he just couldn’t tell her, he was afraid that she would freak out and hide, and since she was the only other person with him that would force him to talk to a beach ball or something for the rest of his time on the Island. He would rather hide his feelings than lose her.

Jack wasn’t alone in these feelings, as Kelsey walked down the beach she caught her brother’s gaze out of the corner of her eye, noticing the lust in his eyes. As much as she knew she should have been disgusted by it, she couldn’t help but feel a little turned on by it. She always had a great relationship with her 21 year old brother and he wasn’t bad looking either, he had short dirty blonde hair, stood at 6 feet and packed 170 pounds of pure muscle from lacrosse. She had always seen her friends drool over him when he came home, and when asked jokingly by one of her friends she feigned disgust. At 19 Kelsey had only a few boyfriends, none of them caring as much about her as Jack. She knew she loved him but just couldn’t get past the final barrier. As she met his gaze and Jack looked away she felt sorry for him, she knew he loved her too but probably couldn’t work up the courage to tell her.

That night as they finished silently eating some fruit by the fire, Kelsey knew why they couldn’t talk to each other, as they both knew what was on their minds. Breaking the silence, Kelsey looked over at her brother and blurted out,

“Do you think were ever gonna be rescued?”

Glancing over at his sister, he noticed the look of worry in her eyes and knew that he should lie to make to her feel better but he couldn’t, he had to be honest. Looking down at the fire he said, “I don’t know sis, it’s been a while since we crashed. I guess we will have to keep looking.”

Taking a deep breath, Kelsey said softly, “I’m getting lonely you know…”

Looking over at his sister Jack said, “What do you mean sis? We got each other and that’s what matters.” Playfully slapping her knee he continued “I wouldn’t ask to be anyone else right now.”

Smiling as she wiped a tear from her eye, Kelsey replied, “You really mean that?”

Jack nodded as he got up and rolled out the towels on the sand for them to sleep on. As they both lay down to sleep Kelsey couldn’t help but feel longing for her brother. It had been so long since she felt such a connection and she needed someone to be with her. As the night grew colder, she instinctively rolled over up against her brother and wrapped her arms around him.

Full of emotion and in her pursuit to get warm, his sister must have forgotten her lack of clothing. But Jack certainly noticed as he felt his sister's soft skin pressed against him. He was wearing only swim trunks so he could feel his sister’s perfect breasts and hard nipples mashing against his chest through her bikini top, the sweet smell and feel of her long, soft, and silky blond hair, and her hot breath tickling his neck was driving him crazy.

Jack always had a little bit of a crush on his hot sister but being stuck on an island with her for a month made it even worse. His cock began to swell to the feel of her perfect body tightly squeezed against him.

His reaction didn't go unnoticed by Kelsey who woke as she felt the swelling of his cock poking against her flat stomach. Pulling away from their embrace, she stared into her brother’s matching blue eyes before her gaze traveled down to the tent forming in his shorts. Kelsey could feel the sexual tension between them for weeks and tried to ignore it but now her mixture of loneliness and hopelessness made her wet with desire.

Neither sibling said a word as she wrapped her arms around him in a lover’s embrace. They both knew what they needed and it was time to stop denying each other’s desire.
Her feelings of loneliness, fear, and love for her brother quickly turned to lust as her cunt began flooding with her juices. Jack moaned as she began rubbing his cock through his shorts, Kelsey smiled as she brought her lips to his ear and whispered, "It’s ok brother... I know you want me… and want you too… I’m not gonna fight it anymore."

Kelsey soon discovered that though Jack had been afraid to tell her about his feelings, he sure wasn't afraid to express them with her permission as he brought her lips to his for a long and passionate kiss. Kelsey moaned into her brother's mouth as their tongues explored each other and she became overwhelmed by love and lust for her brother. Her hands began pulling down her brother's shorts, desperate to feel the heat of his hard cock. As she pulled down his trunks, her brother undid her top, breaking the kiss as he tossed it aside. As their lips met again, he began to caress her soft, perfect breasts with one hand as he ran the other down the silky smooth skin of her hip towards her bikini bottom.

Breaking the kiss, Jack panted, "Kelsey are you sure you wanna do this? There’s no going bammmpphhh."

Cutting his words off with a hard kiss and a squeeze of his shaft, Kelsey broke the kiss and replied "Shut up Jack… I’ve never been surer of anything in my life."

Both siblings groaned as Kelsey began to slowly stroke his hard shaft and Jack had pulled down his sister’s bikini bottoms to her knees, Kelsey kicking them aside as her brother began to rub her throbbing clit.

Breaking the kiss, Kelsey rolled over so that her thighs straddled her brother’s hips. The siblings locked eyes, and giving her brother a seductive grin, Kelsey said softly, "We got plenty of time for other stuff later…but I gotta feel this inside me… shall we take this to its logical conclusion?"

Jack smiled and nodded eagerly as he felt the heat of his sister's hot, wet, dripping cunt hovering just barely over his throbbing cock. Jack couldn’t wait feel his cock inside his beautiful sister’s hot cunt, watching her ride him until she screamed with pleasure. She smiled as she swung her hand around her body between her legs and grasped her brother's cock, ready to guide him into her sisterly depths.

The siblings shook with anticipation, lust, and nervousness as Kelsey rubbed Jack’s cock head in between her wet cunt lips. They both moaned with pleasure as Kelsey guided her brother’s cock head inside her, the feeling of just an inch of penetration overwhelming them both. They cried out as Kelsey slowly lowered her body into her brother’s shaft, taking in the feeling of Jack penetrating her hot silky pussy with his hard shaft. Every inch of her brother's cock that entered her made her shudder and moan harder as her cunt became soaked with her juices. Jack on the other hand, was trying as hard as he could to hold off his orgasm, the combination of the feeling of a tight silky pussy griping his cock and the knowledge it belonged to his own sister was making it hard to hold back.

As Kelsey felt her brother’s cock bottom out, pressing against her cervix, she cried out with a mixture of joy and relief, they had finally consummated their love. Both siblings were so turned on by the forbidden nature of their union that they knew they weren't going to last long, but that wasn't the point. They both knew that it was their first time together, and it definitely wasn’t gonna be the last. Kelsey’s soft moans grew in intensity as she began to raise her body up and down and rock her hips back and forth. As she began riding her brother's twitching cock harder and harder she screamed wildly, "Oh god Jack yes! This feels fucking awesome! Oh gaawwddd! I love you Jack!”

Jack was shocked by the sight of Kelsey's perfect and amazing body riding his cock. He began to thrust back in time with her thrusts, the siblings acting in perfect union with each other. Jack couldn’t help but look on as his sister’s perfect tits, which he had dreamed about for years, now bounced to the rhythm of her rising and falling on his cock. Her eyes were shut, mouth open, panting and moaning with pleasure, and her long soft blond hair flailing all over the place, tickling his body as she occasionally lowered her lips to his own for a passionate kiss. He could barely believe that he finally got to fuck his perfect sister, the girl he pushed on the swing as a kid, the A student, and cheer captain was now riding his cock. All he could do was hold onto Kelsey's hips to keep her from falling and thrust back into her gripping cunt. He couldn’t help but occasionally grasp her soft, perfect, C cup breasts eliciting a moan from her soft lips as he rubbed and pinched her hard nipples.

Despite their enjoyment, neither of them could hold out much longer, the pleasure of their union combined with the knowledge they were fucking their own sibling brought them both closer to orgasm. As Kelsey approached her orgasm, she leaned forward and held Jack tight to her soft warm body as she made short thrusts on his cock and screamed out, "Oh fuck Jack! Oh shit!! I’m gonna fucking cum bro! Ohhh gaawwwdd!! Cum with me bro! Fill your little sister’s tight little cunt with your hot cum!!!

All Jack could do was shut his eyes hard, grip his sister’s hips and let out a loud groan of pleasure as he shot his load inside his little sister’s gripping cunt. Kelsey's soft, slippery orgasming walls closed around his cock, milking him of every drop of his hot seed. Neither Jack nor Kelsey, lost in the pleasure of their climaxes, registered or even cared about the risks as Jack filled his sister's hot fertile womb with a massive load of his potent cum. Kelsey only orgasmed harder as she felt each rope of her brother’s hot cum tap against the back of her hot pussy.

The siblings held each other, kissing and caressing each other’s bodies as they came down from their orgasms. As Jack's cock softened and popped out of his sister's cunt, a tiny bit of cum oozed out of her onto her thigh. But her tight pussy closed up quickly, sealing the rest of his cum deep inside her fertile cunt.

As the siblings lay next to each other in the afterglow of their first sexual encounter together, neither one could speak but they were both happier than they had ever been. As they both drifted off to sleep they knew that everything had changed. They could never go back to the way things were, being just brother and sister, they were lovers now on top of that. The fear of being alone drifted away from their minds, as they didn’t care if they were rescued or not. They had everything needed on their own little island.