The long car ride home from the family cabin was supposed to be boring. Instead, it became the wildest incest gangbang of my life.
My sister Lily was 24, recently given birth, and still lactating heavily. Her milk breasts had grown even larger and heavier, constantly leaking through her tops. She was sitting in the backseat with me while our two friends, Mike and Jake, were in the front. Dad was driving the other car ahead of us.
Lily was wearing a loose tank top with no bra. Her massive milk breasts strained against the fabric, dark wet spots already forming over her nipples. The car was hot and the AC was barely working, so she kept fanning herself, making her heavy tits jiggle.
“These things are so full today,” she whispered to me, pressing her arms against her chest. A small drop of milk beaded on the fabric. My cock instantly hardened.
We had been playing around secretly for months — taboo brother-sister stuff. But never with others around. Today the tension was unbearable.
“Pull over at the next rest stop,” Lily suddenly said loudly. “I need to pump or something.”
Our friends smirked. They had no idea how far this was about to go.
At the quiet rest stop, Dad’s car was already far ahead. We parked in a shaded spot away from other vehicles. Lily climbed into the very back row of the SUV, lay down across the seats, and pulled her tank top up. Her huge milk breasts spilled out — swollen, veiny, with thick nipples already leaking white milk.
“Come here,” she told me. “Help your sister relieve some pressure.”
I leaned in and latched onto one nipple. Warm, sweet milk flooded my mouth as I sucked hard. Lily moaned and held my head against her breast. “That’s it, little brother… drink Mommy’s milk.”
Mike and Jake turned around in their seats, eyes wide. “Holy fuck,” Mike whispered.
Lily smiled wickedly. “You guys want some too? My tight pussy is dripping and these tits need attention.”
The gangbang started right there in the car.
Jake climbed back first. Lily pushed me onto my back and straddled my face in a perfect facesitting position. Her soaked tight pussy pressed down on my mouth while she ground her clit against my tongue. At the same time she pulled Jake’s cock out and started sucking him while Mike latched onto her other leaking milk breast.
I was in heaven — my sister’s tight pussy and ass smothering my face, her milk dripping onto my chest as the guys fed on her breasts. Lily rode my face harder, moaning around Jake’s cock. “My brother’s tongue feels so good in my tight pussy.”
They rotated. I fucked her tight pussy while she facesat on Mike. Jake sucked her milk breasts, squeezing them so streams of milk sprayed across the car. The wet sounds of her tight pussy taking my cock filled the vehicle.
Then the real gangbang began. They took turns fucking her in every position possible in the cramped SUV. Lily’s milk breasts bounced and leaked everywhere as Mike pounded her from behind. Jake fed her his cock down her throat. I slid underneath and sucked her clit while she got fucked.
“Gangbang your sister’s tight pussy,” Lily begged. “Fill me with cum.”
They did — one after another, creampieing her tight hole while she facesat on my face, smothering me with her pussy and ass as cum leaked onto my tongue. Her milk breasts were constantly being sucked and squeezed, covering all of us in sweet milk.
We kept going for over an hour at that rest stop. Multiple rounds. Facesitting, double penetration attempts in the tight space, titfucking her massive leaking breasts, and constant dirty incest talk.
By the time we finally continued the car ride, Lily was a cum-covered, milk-leaking mess, happily sitting on my lap with my cock still buried in her tight pussy for the rest of the drive.
That car ride turned my lactating sister into the center of the hottest incest gangbang I’ve ever experienced — and it was only the beginning of our summer adventures.
After the intense first round at the rest stop, we got back on the road. Lily was a mess — cum leaking from her tight pussy, milk still dripping from her swollen breasts. She didn’t bother fixing her clothes. Instead she climbed onto my lap in the backseat, facing me, and sank her dripping tight pussy down onto my cock for the rest of the drive.
“Keep your sister full,” she whispered as she started grinding slowly. Her massive milk breasts pressed against my face. I latched onto one leaking nipple and sucked hard while she rode me. Warm milk flooded my mouth as her tight pussy clenched around my shaft.
Mike, who was driving now, kept glancing in the rearview mirror. “Fuck, she’s still leaking everywhere.”
Lily laughed breathlessly. “There’s plenty more where that came from. Pull over again soon — I want all three of you at once this time.”
We found another secluded spot a few miles later. This time Lily took control. She pushed me onto my back across the folded-down seats and immediately facesat me, her cum-filled tight pussy grinding on my mouth while she fed Mike and Jake her leaking milk breasts.
“Suck my tits while my brother drinks your cum out of my pussy,” she moaned. The sound of her milk being sucked and the wet facesitting noises filled the car.
I tongue-fucked her tight hole, swallowing the mix of cum and her juices while she smothered me. Her heavy milk breasts were being devoured by the guys on either side. They squeezed them hard, making milk spray across my body.
Then the real Part 2 gangbang began.
Lily wanted to be used in every way. She took two cocks in her tight pussy at the same time while facesitting me. The stretch made her scream in pleasure as milk leaked down her body. They rotated constantly — one in her mouth, two in her pussy, hands mauling her lactating tits the entire time.
“Gangbang your sister harder,” she begged between moans. “Fill my tight pussy again!”
We did. Load after load was pumped into her. When her pussy was overflowing they switched to her ass, then back to her tight cunt. Facesitting sessions were constant — she would ride one cock while smothering another brother or friend with her ass and pussy.
Her milk breasts were the star of the show. We titfucked them, sucked them dry, and covered them in cum only for her to keep producing more milk. The car smelled like sex, milk, and cum.
By the time we finally got home that evening, Lily was exhausted but glowing. She kissed me deeply in the driveway.
“This is just the beginning, little brother. Tomorrow we do it again — and I want even more guys next time.”
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