The Lagoon of Desire

Author's note: A quick shout out and heartfelt thanks to eras_leaner0v who graciously served as a beta reader/proofreader.

Part 1 of a multi-part series. This is my first attempt at an erotic story, so any and all feedback is welcome. I'll respond to DMs if you have any questions, thoughts or notes. This was a delight to write, so I very much hope you enjoy reading!

All characters are 18 or over.

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It had been three years since their family had last visited the island, but Abby Glass and her brother, Michael still knew the route. The path through the rainforest was overgrown in places, but they'd done the walk enough times to know they were going the right way.

Michael, walking behind his sister, watched beads of sweat forming along her toned shoulders. They'd only been on the island for a day and a half, but Abby's skin was already a golden bronze. Michael, who was naturally paler and tended to burn more easily, relied on a regimen of sunblock that he planned to administer every two hours, at least for the first few days—until he built up a baseline tan.

Michael watched a droplet of sweat cascade down Abby's back and disappear into her bikini bottom. His eyes lingered on Abby's perfectly formed ass. Two years older than Michael, Abby had been the envy of many of Michael's high school friends. Now 20, Abby was more beautiful than ever.

Michael studied his sister's flawless skin. As annoying as his buddies were, objectively they were right; if Abby wasn't his sister, he'd definitely find her attractive. I mean, who wouldn't? And her breasts, gravity-defying C-cups; Michael had to admit they were perfect.

"We should be close!"

"What?" Michael saw his sister staring back at him, a wry smile on her face.

"Hello? Mikey."

Nobody but his sister called him Mikey anymore. "Oh yeah. Sorry. I was spacing out."

Abby raised an eyebrow, "No shit, you were like asleep with your eyes glued to my ass."

"I wasn't staring, they just kinda landed there while I zoned out."

Abby laughed, "I know you're a breasts guy, otherwise, I'd be mad at you."

"What, how do you know that?"

"Every time Shana's over, you can't take your eyes off them."

Michael stammered, "I-I do not!"

"Come on, Mikey! Don't lie to me. I don't blame you, they're spectacular."

"Fine, if you can admit it, I guess I can too...Wait are you into Shana's breasts?"

Abby smirked, "Are you asking if I'm gay?"

Michael shrugged, "I don't know. You said they were spectacular."

"Don't be such a prude, Mikey. I can admire Shana's breasts without being a lesbian."

"It's cool if you are. You know...two girls."

"Don't be a perv."

The alarm on Michael's smartwatch chimed. "Hold up a second, Abs." Michael pulled off his backpack, "Sunblock time."

"Are you, serious? You put on sunblock 15 minutes ago."

Michael unzipped his pack and removed a bottle of sunblock, "Two hours ago."

Abby rolled her eyes, "Who's counting?"

"I am." Michael handed her a water bottle, "Here. Have some. It's hot as balls."

Abby gladly partook of the cold water as Michael rubbed sunblock over his chest and arms. Abby's gaze lingered on Michael's ripped stomach.

It was Michael's turn for payback, "My eyes are up here, sis."

"Fuck off. But what the hell Mikey, you have like an 8-pack."

Michael glanced down at his torso, "Huh, I guess I do. I've been hitting the gym hard with basketball season coming up."

At 6'1" Michael was by no means short, but on a hardcourt, he felt undersized, and he compensated by outworking everyone on the team. He could dunk with ease, something he was extremely proud of.

Michael handed Abby the sunblock, "Mind getting my back?"

Abby took the bottle from Michael as he turned around. Abby rubbed the sunblock into his shoulders and then his back. She couldn't help but be impressed by her 18-year-old brother's smooth skin and taut muscles. Just as Michael started to wonder if it was turning into a back rub, Abby smacked him on the shoulder and handed him the bottle. "All done," she smiled, and scooted past him down the path.

Michael threw on his backpack and followed his sister. They walked in silence, enjoying the rainforest, until the path finally burst out into a clearing. Fifteen feet below them was a lagoon filled with the clearest water you've ever seen.

A local had turned Abby and Michael's parents onto the spot nearly twenty years ago, and in the years since, they'd never seen another person at their most favorite place they'd ever visited. The Lagoon of Desire, that's what the local had called it. Abby and Michael called it their Happy Spot.

A path led down to a sand bank that eased into the water, but Michael and Abby had other plans. Michael dropped his pack, then they quickly kicked off their sandals, grinned at each other, and leapt into the lagoon.

Somehow the water temperature was always perfect. Michael surfaced with a loud "WHOOP!" Abby closed her eyes and floated on her back. Michael peeked at his sister's breasts. Her, now hard nipples, poked against the fabric of her top. Feeling guilty, he willed himself to turn away and swim to his favorite spot in the lagoon; a little hollowed out cave that had a protruding rock that was perfect for sitting on. As Michael swam into the cave, he noticed the back of it extended much deeper than it usually did.

"Hey Abby, check it out!"

Abby swam over, "Wow, that's weird! How'd that happen?"

Michael shrugged, "Dunno. Maybe from that hurricane that came through a couple months ago. Let's check it out."

Michael swam deeper into the cave. Abby watched, hesitantly, "Are you sure it's safe?"

"No!"

"Great." Despite her misgivings Abby swam after Michael.

After swimming only a handful of yards, she could barely see in front of her.

"Mikey, where'd you go?"

"Over here." Michael's voice was surprisingly close by. A couple of seconds later he came into view. He was near a rock, his skin outlined in a green halo. Abby swam over to Michael, grabbed ahold of the rock, and saw a beautiful, green gemstone imbedded into wall of the cave.

Abby marveled at it, "It's beautiful."

Michael nodded in agreement, "Any idea what it is?"

Abby shook her head. She and Michael both placed their hand on the rock at the same time. Its smooth surface radiated an unnatural warmth.

Abby shuddered, "Can you feel that?"

"Whoa! It's almost hot. That's crazy."

Abby agreed, "It feels good though." Abby's whole body seemed to pulse.

Michael felt his cock stir in his bathing suit. He didn't think he was horny, but touching the stone made his whole body buzz. They both removed their hands at the same time.

Abby found Michael's eyes in the dark, "That was intense!"

Michael nodded his head. They stared at each other, treading water. Just enough light in the cave for them to hold eye contact. Abby finally broke the silence, "We should head back."

They didn't say a word the entire walk back. Neither could put a finger on it, but they knew they experienced something profound and hallowed—what it was though, they had no idea.

The Glasses were staying at a high-end eco-resort. There was a lavish restaurant and bar with vacation villas etched into the tropical mountains above. As usual, the Glasses rented one bungalow for the parents, and another, with queen beds for Abby and Michael.

At dinner, Abby and Michael filled in their parents, Patrick and Sue, on their hike to the lagoon, though neither mentioned the gemstone. After dinner, as soon as their plates were cleared away, Sue ran a finger along her husband's forearm, "I think the jetlag's catching up with me. I need some rest." Patrick took one look at his wife and stood up, "Me too. I'll walk back with you." Patrick turned to his kids, "The legal age is 18 on the island. You're free to have a drink or two while we're here, just don't overdo it."

With that, Sue and Patrick practically ran back to their villa. Michael turned to Abby, "They're totally going to bone." Abby slapped her brother, "Ick, you're so gross!"

"I'm not wrong though."

"No. They're definitely going to have sex."

Abby and Michael moved over to the bar. Long and Tiki-themed, it was tacky and fun at the same time. They ordered a couple of stiff rum cocktails. Half a drink in Abby continued their conversation, "I sometimes think our parents drag us halfway around the world for the sex."

"What do you mean?"

"Have you ever noticed, that they're all over each other when we come down here? The rest of time they're basically like normal parents."

"Now that you mention it."

Abby sucked on some ice from her now-empty drink. She was already feeling the effects of the rum.

Michael flagged down the bartender and ordered two more drinks. "Dad said one or two. May as well make it two, right?"

Abby laughed, "Don't get me wrong, I love coming here, but the island has some weird energy. I'm definitely hornier here, than back home."

"Thank God you said that. I thought I was the only one. Also, can we talk about that stone?"

Abby felt a shiver run through her, "That was seriously weird."

"When I touched that stone I felt something through my whole body, and this is probably TMI, but also my dick definitely felt it."

"

Maybe TMI?

Definitely TMI."

"Sorry, sis."

Abby grabbed Michael's hand, worried she'd hurt her brother's feelings. "No, it's fine." Abby blushed, remembering that feeling the moment afterwards, when she and her brother stared at each other, "I felt something too." Abby self-consciously moved her hand away.

"Do you think mom and dad are done having sex? I don't want to hear them when we walk past their bungalow to ours."

"Probably not, but by the time we're done with our drinks, the coast should be clear." Abby paused, "Have you ever walked in on them?"

"No, have you?"

"Once. Last year. I was home from break. You were at a sleepover. I came home from a party. I went upstairs to tell them I was home. Walking down the hall I thought I heard moans or something. I should have gone to my room, but I was a little buzzed, and a little curious. I padded down the hall. Their door was ajar. I pushed it open just a bit so I could see inside."

Michael gulped, "What'd you see?"

"Mom was kneeling on the floor. Dad was lying on the edge of the bed. They were both naked. Mom was pumping dad's dick with her hand. She was saying stuff like, I love your hard cock, you want me to suck that cock of yours?'"

"Oh my God!"

"I know. I remember dad said, 'suck it slut,' and mom went down on him. Like deepthroated him. I couldn't believe it. As he got close, mom begged him for his cum. Then he erupted all over her. Mouth, face, tits. Totally covered her in cum. I watched her lick it off his dick and her hand, and then I got scared they'd see me, so I tiptoed back to my room."

Michael could feel his dick straining against his shorts. "Are you fucking with me?"

"No, I swear."

"Jesus. You're making me feel like a perv getting turned on listening to that story."

Abby emboldened by the alcohol smiled at her brother, "How do you think I felt when I went into my room and fingered myself thinking about dad cumming all over mom?"

"Fuck, Abby."

Abby stood up and polished off her drink, "Come on. If mom and dad aren't done, maybe it won't be such a bad thing."

Michael took a moment to adjust himself before following his sister.

The walk towards their bungalow was narrow with a steep pitch. Abby stumbled on step, and grabbed Michael's arm for support. "Thanks, that second drink hit hard."

They instinctively grew quiet as they approached their parents' bungalow.

Abby whispered, "Let's look through the blinds."

The siblings crept towards the window. The light was on inside. Their parents were in a post-coital embrace. The sheets around their waists, they were naked. Michael gawked at his mother's breasts. Easily a D-cup, they had very little sag despite the fact that Sue was now 47 years old. Her hard, pink nipples stood out proudly. Sue leaned over, kissed her husband on the lips then got out of bed. Michael marveled at his mother's still perfect figure, the dark hair around her vagina was neatly trimmed and inviting. Sue walked to the bathroom. Abby tugged Michael and they soundlessly edged away towards their bungalow.

Inside their own bungalow, a safe distance from their parents, Abby and Michael spontaneously burst out laughing.

Through fits of laughter Abby managed, "Wow, mom's got a banging body."

"Ugh. I know. This is all wrong, Abby! Mom's not supposed to be hot. She's supposed to be mom!"

"What's the matter, is little brother turned on by his own mommy?"

"Quit it, Abby." Michael slumped onto his bed, "That messed me up."

"How do you think I felt when I walked in on them?"

Abby walked towards their patio, "You can sort it out in therapy. I need some air. Those drinks hit hard."

"You already said that."

Abby stepped outside and leaned against the railing, her back to her brother. Michael admired how nicely Abby looked in her little sundress. He thought about the events of the day—the way his sister looked in her bikini, the feel of her hands rubbing sunblock into his body, the gemstone, Abby's story of walking in on their parents, and finally seeing his mom fully naked. Michael was hard as a rock as mental images of his naked mom, and bikini-clad sister filled his brain. How was he suddenly having feelings for both his sister and his mother?

"Mikey, get out here!"

Michael jumped out of bed, and went his sister, "What, is it?"

"The view. It's stunning."

Beyond the rainforest foliage, was the ocean, dotted with other tropical islands. Boats moored off-shore, and palm trees swaying in the breeze.

Michael looked at the view and then his sister, "It's beautiful."

Abby sighed, "It's stunning...and look, the moon is rising!"

A luminous full moon was partially visible over the horizon. Abby impulsively grabbed Michael's hand. Michael felt his cock twitch.

As the moon crested the horizon the moonlight bathed them in an ethereal green glow. They both felt it, that electric charge that coursed through them when they touched the gemstone.

Abby and Michael stared at each other. Finally, Abby leaned in and hugged her brother close. "I love it here so much." Abby felt Michael's cock press against her stomach. She stepped back.

"Is that your dick!?!"

"Sorry, I-I..."

"Ewww, Mikey."

Abby went into the bungalow with Michael on her heels.

"Abby, wait!"

Abby faced her brother, "Why was your dick hard?"

"I'm 20, sometimes it gets hard for no reason."

"Hard like

that

?"

"I don't know, we just saw mom. Even you said she had a banging body. So, I dunno. A couple of drinks, this island. Mom's naked body, knowing that she just had sex. I'm sorry, then you held my hand and hugged me—it was a weird moment. So, yes, I guess I got a hard on."

"All right Mikey, you don't have to get so defensive."

"And that story about walking in on mom and dad. Were you trying to turn me on?"

Abby smiled, "Maybe I was toying with you a little. Like I said this place makes me horny. Sorry for giving you shit about your hard on."

"It's okay, I'm sorry. I feel like a jerk."

Abby had a glint in her eye, "How big is it anyway?"

"Abby!"

"Is it small? It felt small."

"It's not small!"

"Okay...Show it to me, then."

"Don't fuck with me, Abby. I'm not pulling out my dick so you can make fun of me and call me a perv."

"You're a prude."

"No, I'm not, I just don't want you to make fun of me."

"What if I show you my tits? I know you're dying to see them."

"Quit playing with me, Abby."

"I'm serious."

Michael looked at his sister. She seemed serious, but he knew he'd be mortified if he fell for one of her tricks.

"Show me first."

"Fine, chicken!"

Abby turned around so her back was facing Michael. She pulled at the drawstring of her dress and it instantly fell to the floor. Abby wasn't wearing a bra, just a pair of black panties. Abby looked over her shoulder at Michael, "Oops."

Michael couldn't speak if he had wanted to. The energy in the room had shifted in a matter of seconds. The teasing, the joking...that was out the window. Abby smiled at him, "Do I look okay?"

Michael nodded his head.

Abby turned around, her arm covering both her breasts.

"Do you want to see them?"

Michael nodded his head.

"Then say it."

"I want to see your tits, Abby."

A moment of nerves almost overtook Abby. What was she doing? She had in fact just wanted to get Michael to expose himself so she could tease him a little, but now she was about to show her brother her tits. Half of her wanted to stop, but the other half wanted her brother to look at her; to desire her. Too far in to turn back, she knew she had to at least give him a look.

Abby lowered her arm. Michael stared at her breasts. They were even more incredible than he imagined. They actually looked a little bit bigger than they did earlier in the day, and her hard, pinkish-brown nipples stood out a bit more than usual.

"Fuck, Abby! They are...You're so fucking hot!"

Abby blushed, "Thank you." She sat on the end of her bed, "Now you. Shirt first, I want to see those abs too."

Wait, was Abby admitting that she liked how he looked? Michael took off his shirt, then unbuttoned his shorts and let them fall to the ground. His dick tented out against his boxers. Abby watched as Michael slid his boxers off. He stood naked in front of Abby. Abby stared at his dick. He was naked in front of his sister, who was nearly naked herself. Her eyes roamed over his body, resting on his hard dick.

"Hmm. So this is what you're working with, huh? Oh, well. I've seen a lot bigger."

"Hey!!!"

Abby laughed, "I'm joking! Guys are always so insecure about their dicks." Abby stared at her brother's cock, "But you have to know you're big, right?"

Michael smiled, "I had a feeling. The few girls who have seen it all said it was huge, but I didn't know if they were just being nice." He looked down at his dick, maybe he was imagining it, but it actually looked a little bigger than usual.

Abby couldn't get over how big her brother's dick was. "Don't let it go to your head, baby brother, but it's fucking enormous." Abby's plan of just messing with her little brother had been forgotten; this thing, this massive cock, was wholly unexpected. She wondered how big it was, she wondered what it would feel like to stroke. She knew she needed to stop this. It was her little brother, but that hard cock was making her feverish...knowing that she was the cause of her brother's massive erection only fueled her wantonness.

"It doesn't feel fair that I'm naked, but you still have panties on."

"You want to see my pussy?"

Michael's voice was raspy, "Yes."

"Naughty brother wants to see his sister's pussy."

Michael lay down on the edge of his bed; the side closest to Abby.

Abby lifted her hips and slid off her panties. She was clean shaven. Michael could see Abby's clitoris peeking out from its hood. "Wow, you shaved everything?"

"Do you like?" Abby ran a finger over her slit and drew in a sharp breath. "Oh. That feels. Good."

Michael lay back and slowly pumped his cock. He looked at his sister fingering herself.

Abby smiled, "Now that you see me naked, do I look better or worse than you imagined?"

"B-better. Your tits are amazing. Your whole body..." Michael continued to rub his cock as he watched Abby tease a nipple with one hand and finger herself with the other. "I get really wet when I'm turned on. God this feels good. When you were checking me out earlier today, were you fantasizing about me?"