Tuesday , August 9 2022

Sister Kirsten falls in love with my cock on family car trip

I was stuck in the back 3rd row seat of our family SUV, watching videos on my phone of myself and my girlfriend having sex. My parents were in the front, and the middle of the car was piled high with suitcases, ice boxes, and junk for the trip. My twin sister, Kirsten, was asleep on a pillow, leaning against the window. I was horny as fuck and slowly rubbing my dick through my shorts.

We were moving across the country in the middle of summer, and my sister and I had left behind a boyfriend and girlfriend. My girlfriend and I had been having sex 3 or 4 times a day, mostly oral and quick fucking. She was a true nympho. Everything turned her on and she had endless, juicy orgasms. We fucked, sucked, and fingered almost non-stop for 2 months, and now it was over. I was a junkie without a fix, with a 9-inch cock as hard as steel, and nothing to do but watch videos of my girlfriend, and try not to cum. I needed to cum, but I would somehow have to get rid of a lot of evidence, because I cum like a porn star. I couldn’t cum in my shorts without making a huge mess.

I was entranced by a video of my cock being swallowed by my girlfriend, when my sister put her head against my shoulder. “Fuck,” I whispered angrily, “stay on your own side!” I fumbled with the phone with one hand, while trying to hide my dick, which was straining to rip through my shorts.

“What?! Oh my god! You’re watching porn!” Kirsten slapped my arm and tried to grab my phone. She reached into my lap, causing me to push down to protect my erection from discovery, and I had to give up the phone.

She stared at the screen. “You like watching guys with big dicks getting sucked off?” she teased. “She’s really enjoying it. I think I’ll keep this for a while.” Kirsten’s mouth was open and her eyes were transfixed on my phone.

“Give me back my phone!” I couldn’t decide if it would be more embarrassing for her or for me to tell her that she was watching her own brother fucking her best friend’s mouth.

My sister and I had been doing our own thing for the past year and not spending much time together. Plus, I stole her best friend, who had been too distracted by my dick to hang out much lately. Kirsten was thin, but muscular and athletic. Gymnastics and cheerleading gave her strong thighs and a round, plump ass. Her tits were perky B-cups, her waist was narrow, and her strawberry blonde hair made her popular with the boys. I never bothered to look at her for long before, but in my present hyper-sexual state, her naked, tan legs looked good enough to eat. Her green eyes were filled with lust and the backseat was beginning to smell like musky pussy.

Suddenly her eyes got bigger. She turned and looked at me and said, “This is Mandy! What the fuck? I’m watching a porno of my own brother? Oh my god,” she said. She continued to watching.

“Well, give it back then!” I reached out my hand and she looked up and slowly gave me the phone. She was quiet, but staring at my lap. She leaned a little closer and said softly, “Were you playing with yourself? Were you going to jerk off right next to me?” She glanced toward the front, but mom and dad were clueless, listening to NPR on the radio.

“No! I’m not masturbating. I’m just bored and I miss Mandy, so I was looking at our videos.”

“Then why do you have your hand on your dick?” Kirsten asked.

“Well, it’s hard and I’m trying to hide it. It’s not going down.”

She eye-fucked my lap for 5 awkward seconds. “Does it hurt?” She was more compassionate now and couldn’t take her eyes off my crotch. Her pussy aroma wasn’t helping my boner, either.

“It doesn’t hurt exactly, but it is uncomfortable. Just stop looking and do something else!” Kirsten wasn’t wearing a bra under her shirt, and I could see her puffy nipples rising up.

“How big is it? It looked huge on the video.” The same lust she possessed looking at the screen, she now had for me. I swear her lips got redder and fuller and I could see her pink tongue glisten in her mouth. “Just move your hand and show me. I’ve seen a dick before.”

“Gross. I don’t want to know my sister’s sexual history.”

“Come on. I’ve already seen it on the video.”

I groaned. I needed to pull it out so bad and empty it into a towel. “Okay.” I raised my hand and my cock pushed up. My silky athletic shorts clearly showed the outline of my entire erection, right down to the swollen head, halfway down my thigh. Both of us just stared at it.

“Holy shit, you are huge. No wonder Mandy didn’t have time for me anymore.” She stared a little longer. “Go ahead and keep watching your videos. Do you need to jack off?”

“Hey! That’s not appropriate. Just leave me alone and let me try to relax so it goes down.”

But we continued to just stare at it. And I swear I could smell her pussy as if it were sitting on my face.

“It’s not going away is it?”

I groaned. “No.”

“Just jack off and get it over with. I won’t tell anyone.”

My sweet, innocent sister telling me to jack off, while she sat twelve inches away from me, staring a hole in my shorts, had me about three pumps away from exploding. “Really? This is so wrong. Reach into that bag in front of you and get some paper towels.”

She grinned and eagerly grabbed the paper towels and tore off one sheet.

“Better make it two, please.”

She looked at my dick and then at the paper towel in her hands with a worried look on her face, but grabbed a second towel.

“Okay. Are you going to give them to me?” I asked.

“I’ll hold the towels so you can concentrate on that,” motioning with her head to the problem at hand.

I glanced toward the front of the car and out the windows to make sure it was safe to stroke my cock in front of my sister. Ha! I pulled up the leg of my shorts and my angry penis bounced up like a swollen diving board. It was super hard and oozing pre-cum.

“Holy shit that’s a nice cock,” whispered Kirsten. Her mouth was open and her eyes were all over my manhood.

I grabbed the head and lubed my hand with the pre-cum. I started stroking slowly because I was so sensitive and it felt so good. I groaned and thrust my hips. More pre-cum came out. “Okay, I’m going to cum in about 15 seconds. Give me the towels.”

Kirsten wasn’t responding. She was in a cock-trance, with my paper towels in her right hand, and her left hand went between her legs, clutching her crotch.

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