We were home alone for the weekend, just me and my older sister Lisa, both of us well past the age where we should have known better. I was twenty-five, she was twenty-seven, and the house felt too quiet after Mom and Dad left for their trip. We started in the attic looking for old board games, but we found the box instead. It was tucked behind some dusty luggage, marked only with Dad's handwriting: "Private." Inside were stacks of Polaroids and printed photos, all of them showing family members fucking like animals.
Lisa pulled out the first one and her eyes went wide. "Holy shit, look at this." It was our aunt on her knees, sucking our uncle's cock while another relative watched from the bed. The next photo showed Mom and Dad, Mom bent over with Dad's dick buried balls-deep in her ass, her face twisted in pure slutty pleasure. Page after page of incest sex picture stories, real ones, all of them raw and filthy. Lisa's cheeks flushed but she didn't put them down. Instead she shifted closer on the attic floor, her thigh pressing against mine.
"These are fucking hot," she muttered, voice low and dirty. She flipped to one of two sisters eating each other out. "Look how wet she is. You think they really did this?"
I couldn't lie. My cock was already hard, straining against my jeans. "Yeah.
They look like they love it." Lisa glanced down at my bulge and smirked, that same smirk she used when she wanted to push buttons. She reached over and squeezed me through the denim.
"Show me how much you like them," she said. No hesitation. I unzipped and pulled my cock out, thick and leaking at the tip. Lisa licked her lips and kept turning pages while she wrapped her fingers around me and started stroking, slow and tight. "Look at this one. Brother fucking his sister from behind while she looks at the camera. Bet she came hard."
She pumped me faster, thumb rubbing over the head, spreading the precum. I groaned and grabbed one of her tits through her tank top, pinching the nipple until she gasped. "Keep going," I told her. "Tell me what you'd do if we were in one of these pictures."
Lisa set the photos down just long enough to yank her top off. Her tits spilled out, full and heavy, nipples dark and stiff. She straddled my lap facing me, grinding her shorts-covered pussy against my bare cock. "I'd let you fuck me just like that," she said, voice rough. "I'd spread my legs and beg you to pound my cunt while someone took pictures. Make it look exactly like those incest sex picture stories."
I shoved her shorts and panties aside and slid two fingers into her. She was soaked, dripping down my hand. "You're already ready for it," I growled, pumping her hard. Lisa moaned and rocked on my fingers, then reached down to line my cock up with her entrance. She sank down in one smooth motion, taking every inch until her ass met my thighs.
"Fuck, yes," she hissed. "Your cock feels so good in your sister's pussy." She rode me rough, tits bouncing, while we kept looking at the photos spread around us. One showed a father and daughter in the same position. Lisa pointed at it. "That's us now. Look how deep he's in her. Do it like that."
I grabbed her hips and thrust up hard, slamming into her wet heat. The attic filled with the sound of skin slapping and her filthy moans. "Tell me you're my incest slut," I demanded.
"I'm your incest slut," she panted. "Fuck your sister's cunt. Fill me up like they do in those pictures." She came first, clenching around me, juices running down my balls. I flipped her onto her back on the old blanket and drove into her, pounding until I emptied deep inside, rope after rope of cum flooding her.
We didn't stop there. Lisa rolled onto her stomach, ass up, and I took her again while she held the photos in front of her face, describing each one in the dirtiest detail. By the time we finished the stack, we had our own set of pictures to add.
