We pitched the tent in a clearing far from the trail. Just me and my sister, both grown adults, no parents, no rules. The sun was dropping and the air smelled like pine and dirt. She bent over to hammer the last stake and her shorts rode up, showing the bottom curve of her ass. I stared. She caught me and smirked.
"Like the view, big brother?" she said, voice low.
I didn't answer. I walked over, grabbed her hips, and pulled her back against my crotch. My cock was already hard. She pushed back, grinding once, then stood up straight like nothing happened. We finished setting up in silence, but the air felt thick.
Night fell fast. We sat by the fire eating cold sandwiches. She had on a thin tank top with no bra. Her nipples poked through. I kept looking. She knew. After the food she stretched, arms over her head, tits lifting. "I'm going in the tent," she said. "You coming?"
I followed. Inside the tent it was dark and close. She stripped off the tank top first. Her tits were full and heavy, nipples dark. She pushed her shorts and panties down in one move. Naked, she lay back on the sleeping bag and spread her legs.
"Fuck me," she said. "Been thinking about your cock all day."
I got my clothes off fast. My dick stood straight out, thick and leaking. I dropped between her thighs and shoved in deep on the first thrust. She was wet already, hot and tight. She grunted and wrapped her legs around my waist.
"Harder," she told me. "Don't be gentle. We're alone out here."
I fucked her like that, raw and fast, the tent shaking with every slam. Her pussy made wet sounds around my cock. She clawed my back and kept saying "fuck" and "yes" and "deeper." I came first, pumping thick loads into her while she squeezed around me. She didn't stop moving until I pulled out.
We lay there breathing hard. Then she rolled over and took my cock in her mouth, sucking me clean, tasting her own juices and my cum. I got hard again quick. She climbed on top this time, sank down slow, and rode me while the fire outside crackled.
She talked the whole time. "Your cock feels bigger than I remember. Fill me up again. Make it messy." I grabbed her ass and thrust up to meet her. She came with a sharp cry, pussy pulsing, then kept riding until I shot another load inside her.
We didn't sleep much. Around midnight she woke me with her mouth again. This time she got on all fours and told me to take her from behind. I did, pounding into her while my balls slapped her clit. She reached back and rubbed herself until she shook and came again. I stayed inside her after, letting the cum leak out around my dick.
Morning light came through the mesh. She was already awake, stroking me. "One more before we hike out," she said. She straddled me facing away and worked my cock into her slick cunt. We fucked slow and deep that time, both of us watching my shaft disappear into her. When I came she stayed seated, grinding until every drop was in her.
We packed up quiet. No one else was around. On the drive home she sat with her hand on my thigh, occasionally squeezing my cock through my jeans. "Next trip," she said, "we're bringing lube. I want you in my ass too."
The road stretched out ahead. We already knew we'd be back out here soon.
