My Girlfriend's Naughty Sister

GF's sister, Nina came to stay with us while she took college summer classes.

And we all drank every night. Alcohol makes my GF horny, so we had some intense fucking. Nina slept in the living room and couldn't help but hear us. Later I found out Nina fingered herself to the sound of me fucking her sister's brains out...

By this time Nina felt comfortable in the apartment and, like her sister, she'd always slip her bra off under her blouse. Nina sat on the couch rubbing her boobs. "Max, my tits are growing again, and they hurt."

When Nina leaned forward to untie her shoes, I glanced down her loose t-shirt. Her boobs were smaller than my GF's but nice and suckable, with pointy pink nipples.

Nina caught me staring at her tits, blushed and flashed a freckled smile.

The next day we were drinking rum. But GF drank too much and passed out in bed, leaving her sister and me alone in the living room. We chatted and Nina was a bit tipsy. "Hey Max, watch this."

She tottered to her feet showing me dance poses. Nina grinned and bent over in front of me, grabbing her ankles. She looked up through her legs, wiggling her ass. "See, I told you I was flexible."

By now I was rock hard, with a bulging lump. Looking up from her legs, Nina saw my lump and jerked up but fell, butt first into my hands. We looked at each other feeling the sexual tension.

Nina tried to get up and hit my lump. It twitched and she glared at me... I waited for a face slap. Instead, Nina rubbed my cock-lump causing another twitch.

She giggled, "You must be pretty horny, that thing is loaded and ready to go off. What are you going to do for your nightly bang-bang?"

I laughed. "We don't do it every night."

"LIAR! I hear you, fucking so hard the whole bed bounces off the floor." She smiled. "And you make my so damn horny I have to finger myself. It's your fault."

I paused a second to process this... My cock grew bigger and stiffer, imagining Nina fingering herself. Then I felt her fingertips brushing against my throbbing lump.

"It's your fault for not sharing your... Max thing."

Her blue eyes stared up into mine as she squeezed my lump. Her naughty hand reached inside, groping my boner while we looked at each other. I couldn't take it and smashed our lips together, sucking each other's tongues.

Nina dropped to her knees, pulled my shorts down.

My cock-log sprang up in her face. She licked the tip with a trail of precum stuck to her tongue. Opening wide, Nina wrapped her lips around my shaft and took my cock halfway before gagging.

"S-sorry, I've never sucked one this big."

Nina's lips quivered as she bobbed head on my shaft, her freckled cheeks hollowing as she sucked. It felt like heaven, her soft wet lips and tongue lapping at my cock. I held her head and pushed deeper.

"Oh baby...that's it. Suck it." She giggled and drove her head down forcing my cock to her throat, with loud slurping sounds.

My balls erupted, gushing out semen. Nina gagged and swallowed and choked down my goo. After the last swallow, Nina stood up, gave me a spermy kiss and winked.

"I'm on the pill."

That was my cue, I grabbed her petite tits and my hand slid into her yoga pants, clutching her wet pussy. She let out a gasp when my fingers slipped in. One finger teased her clit while another slid into her hole.

But my cock ached. Yanking Nina's pants down to her ankles, I bent her over the sofa. My boner slapped her wet pussy and slowly pushed in, stretching her fuck- tunnel.

Nina moaned, "Oh Max..." and let out a quiet gasp as I thrust deep inside. I felt her tremble as she tightened her pussy muscles around my pumping shaft.

Luckily my GF was passed out. Nina moaned louder as I fucked harder, my hips smacking her ass. Nina climaxed quickly, her cunt juices soaking my cock. I didn't stop pumping.

Nina looked over her shoulder while I pounded her twat. "Hey Max, I want on top. Let me ride your cock like a cowgirl. I pulled out, dripping her juice on the floor and sat on the couch.

Nina moved up, opened her pussy and slowly sat on my cock, guiding it into her fuck-hole. She rotated her hips around, screwing her teen pussy onto my shaft.

Grabbing her waist, I pushed up into her cunt and sucked on her pointy tits, pulling her aroused nipples with my teeth.

Nina moaned and rocked, riding my fuck pole. Her pussy gripped my cock hard as she rode me. Pushing her feet in the air, I bent the flexible girl in half. Her body shook as I plunged inside, pushing my cock to the bottom.

My balls burned, so I grabbed the back of her neck and fuck hard, keeping her bent like a pretzel. My cock hammered her tight twat harder and faster.

Lille Nina was so cute, squealing like a schoolgirl every time my cock hit bottom.

My cock couldn't hold back. It slammed all the way in and spewed, twitching with each spurt of warm jism. Nina climaxed at the same time, trembling wildly as I finished spewing.

We stayed in that position for a long minute, both catching our breaths before I let Nina's legs down and pulled my prick from her clutching hole. I felt proud as my cum leaked down her red and swollen pussy.

The next morning, breakfast with my girlfriend. Nina walked in bowlegged and gingerly sat in the seat. She winked at me, but we acted like nothing happened. Like we hadn't had our own little suck-fuck party.

Sweet Nina stayed with us for another month, and we screwed at every chance. She'd ask me to take her to Walmart and blow me all the way there, then bang me in the parking lot.

Once we drove to the lake and fucked.... In the backseat, in the water, and on the beach. "Ouch Max, I don't like screwing on the beach... Sand gets up in my holes."

Nina's back at the university. But next time we meet up, I'm filling her sweet twat with hard cockmeat.