The Blue Envelope
Copyright© 2026 by Tarl Cabot
Chapter 5: The Rock Altar
Incest Sex Story: Chapter 5: The Rock Altar - Eric found that a Random Act of Kindness could change his life in so many ways. Some of them were quite a surprise.
Caution: This Incest Sex Story contains strong sexual content, including Ma/Fa mt/ft Ma/ft mt Age Gap Teenagers Consensual Romantic Gay Lesbian BiSexual Heterosexual Fiction Rags To Riches Sharing Incest Son Brother Sister Father Daughter Grand Parent Group Sex Harem Orgy Anal Sex Double Penetration First Masturbation Oral Sex Pregnancy Big Breasts Public Sex Small Breasts Nudism
The lagoon held them like a warm hand. Saltwater licked the raw places on Eric’s body—his knees, the inside of his ass—and soothed them. Tina floated on her back, tits riding the surface, nipples tight from the cool morning air. Her cunt was still puffy from Keith’s earlier work, the lips slightly parted, showing a sliver of pink.
Keith swam up behind Eric and wrapped an arm around his chest. His cock, half-hard again, slid along the crease of Eric’s ass. “Round two,” he murmured against Eric’s shoulder.
“You’re insatiable,” Eric said.
“You made me this way.”
Tina laughed, a bright, carrying sound. “I have an idea.” She righted herself, treading water, and swam toward the shelf of black rock that jutted into the lagoon. The stone was smooth from centuries of surf, warm from the morning sun. She hauled herself up and sat, legs dangling, water streaming from her dark curls. “Come here.”
They followed. Eric climbed up beside her, Keith on the other side. The rock was wide enough for all three, flat and slightly tilted, like a natural altar.
Tina reached over and took Keith’s cock in her hand. He was fully hard now, the shaft curving up thick and veined. She stroked him root to tip, smearing the precum that had gathered at the slit. “I want you in my ass,” she said to Eric. “And I want Keith on my face.”
Eric’s stomach flipped. “Both at once?”
“Both at once.” She lay back on the warm stone, her hair fanning out, and pulled her knees to her chest. The position opened her completely—cunt glistening, asshole a tight, dark pucker. “I’ve been thinking about it since the tub. The way you stretched me. I want more.”
Keith was already moving. He straddled her head, facing Eric, his cock bobbing inches from her mouth. She reached up and guided him down, and he slid into her throat with a wet, throaty moan.
Eric found the bottle of oil they’d brought from the bathroom. He slicked his fingers, then pressed two against Tina’s hole. She was still loose from Keith’s earlier work, but not loose enough. He added a third, scissoring, watching her brow furrow even as her hips pushed up to meet him.
“More,” she said around Keith’s cock.
He pulled his fingers out and pressed the head of his cock against her. The ring of muscle resisted, then gave. She gasped—a tight, high sound—and her nails dug into Keith’s thighs. Eric pushed in slowly, inch by inch, until his balls rested against her ass.
“Fuck,” he breathed.
Keith looked down at him over Tina’s body, that green-eyed smirk cutting through the morning glare. “How’s she feel?”
“Tight. Hot. Perfect.”
Tina wriggled beneath him. “Move, Daddy. Fuck my ass.”
Eric moved. Slow at first, long, dragging strokes that made her moan around Keith’s shaft. Then faster. The slap of his hips against her ass echoed off the cliffs. Keith matched his rhythm, fucking her throat with deep, wet thrusts, and Tina took it all—drooling, gagging, tears leaking from the corners of her eyes.
“Close,” Keith grunted.
“Not yet,” Eric said. “Wait for me.”
He fucked her harder. The rock scraped his knees raw, but he didn’t care. Tina’s ass gripped him like a fist, tight and pulsing. He could feel Keith’s cock through the thin wall of tissue separating them—a phantom sensation, ghost-thick, driving him wild.
To read the complete story you need to be logged in:
Log In or
Register for a Free account
(Why register?)
* Allows you 3 stories to read in 24 hours.