Brother Sister Story I
Thank you to Oldbroad76 for editing.
"Okay, long drive today," My Mum said as I put a third suitcase into my car. "How long do you think you can go without stopping?"
"I can go for hours," I replied. "It's Grace who will need to stop to pee every 5 minutes!"
"Shut up!" Grace shouted from the front door of our house.
"You two better not be arguing the entire drive there, or we will swap who's in which car!" Our Mum sighed.
"Yes, Mum." Grace and I replied in unison.
My car was filled with suitcases while our Mum and Dad's was filled with food. We were all set for our family weeklong holiday. We were driving to the other side of the country, but it was a drive I was not looking forward to.
Grace opened the passenger side of my car, as she stepped in, and I couldn't help but gaze at her shapely arse hidden by her tight, blue jean shorts.
"Right, see you later." I said to my Mum as I got into the driver's side.
"Ready?" Grace asked.
"Yep, let's go." I replied.
--
We were an hour into our road trip.
On the motorway my Mum and Dad had sped off, given that their car was much nicer than mine.
In my car was me driving and my sister, Grace, in the passenger seat. I was 20, and Grace was 18, and we were as close as most brothers and sisters were. She was nice, if a little annoying and more wild than me. However, it was impossible to not notice how Grace had come into her body since turning 18.
She had long blonde hair that shined like the sun, and although she had a slim frame, her chest had become more and more noticeable as of late, especially as she was wearing a loose white vest that blew in the wind, revealing her white lacy bra underneath.
Occasionally I would look across the car and see underneath her vest and get a glance at her cleavage. Yes, it was wrong that I would look at my younger sister like that, but she was hot!
She was sat on her knees, wearing blue denim shorts that stopped very high up her thighs. Grace's legs weren't long, but they were toned and smooth, the sort of legs that forced you to stare at them.
More than once on the drive, I accidentally swerved across a lane as I got distracted by her.
"I'm so bored!" Grace moaned, her blonde hair blowing back due to her open window.
"Well, there's another three days of driving, so get used to it." I told her.
I didn't expect this drive to be fun, but being in such close quarters with my sister, whom I was massively attracted to, was making it even harder. With each glance over I panicked that she would catch and ridicule me.
That was until her hand suddenly reached across and took a handful of my crotch.
"Wooah!" I shouted and swerved the car. "What are you doing?!" I shouted, getting the car back between the lanes.
"You've been staring at me since we got in the car," Grace told me. "I was seeing if you were hard."
Her fingers remained gripped around my growing cock, blocked by my jeans.
With my eyes on the road, I had a quick look down, and Grace's fingers were tightening and loosening around my cock that was getting harder and harder.
"You alright there?" I asked sarcastically.
Her hand moved away, and I immediately regretted saying anything.
"Not as good as you are apparently." Grace joked.
Her window slowly rose up until it closed, but I didn't realise how silent the car was without the window open and the air blowing in.
Grace pulled her hair back behind her head and stretched, her chest pushing up in front of her, and I couldn't help but look over.
"You're so easy to tease." Grace laughed out.
"You're the one practically shoving your tits in your brother's face." I joked back.
"You'd like that, wouldn't you," Grace said with a half smile. "Your sister shoving her tits in your face."
I glanced at her again to see a cocky grin before looking back on the road.
"I wouldn't say no." I replied, smiling at myself.
"Perv." Grace joked.
The car went deathly quiet after that. We had always been comfortable with each other, but something felt different now, as though we had crossed a line and didn't know how to act.
"Fine." Grace sighed.
My head turned to the side and back to the front constantly as Grace sat forward.
"What are you doing?" I asked, seeing my younger sister moving in the corner of my eye.
"What you asked for." Grace replied back, and the seriousness in her voice both frightened and excited me.
Still trying to watch, Grace grabbed the hem of her loose vest and effortlessly pulled it over her head before throwing it to the floor by her feet.
My cock jumped as my sister sat next to me in her bra. I cursed the fact that I had to focus on the road, wishing I could properly look at her cleavage.
That was until I noticed her bra being pulled forward. One of Grace's arms straightened, and I saw her bra drop on top of her vest.
I quickly turned my head, and I saw them. It was just a glance, but Grace's bare chest was out. They were glorious! Even with only quick looks, I could see their perfect shape and size.
"Are they real?" I asked since they looked too perfectly positioned to be real.
Two silky smooth spheres were attached to her chest, bouncing slightly with each movement. The weight of them made them fall down only slightly, but age was on her side. Perfectly placed were her stiff nipples, and her areolae were large and soft to look at.
"Yes, they're real!" Grace shouted and slapped my arm.
In the corner of my eye, I could see them bounce, and what I would've done to reach across and take her globes into my hands.
Instead, I had to settle for watching Grace's tanned fingers hold onto them. Her fleshy breast pushed between each of her fingers, her stiff nipple poking through a gap as she pulled on them.
"You know people can see in, right?" I said, noticing plenty of other cars on the motorway.
"Aww, are you shy?" Grace mocked, the little tease!
"Oh, I'm not shy," I told her. "I just didn't realise what a slut my sister was."
"A slut now, am I?" Grace argued. "Well, if I'm a slut, then I'd better be a good slut."
I could see her playing with her big tits next to me, pulling at her firm, pale nipples. My cock was now at full attention in my jeans, desperate to be freed.
"Would a slut finger herself in a car while sitting next to her brother?" Grace then asked me.
My mouth instantly filled with saliva. Was she being serious? She had always been jokey and sarcastic, but I really couldn't tell.
"Oh, I guess not." Grace then said when I didn't reply, knocking some sense into me.
"Actually," I replied and saw a smirk on the side of my sister's face, "a real slut would take all her clothes off before fingering herself, so anyone driving past could see."
Grace must have been surprised by my comment as for the first time in her life she was silent.
"Fair enough." She said as her hands went to the button on her jean shorts.
My heart was beating faster than my car as I tried to both watch Grace and the road. I could see when her button was undone, and she unzipped her shorts.
Lifting her firm arse from the seat, Grace pulled the denim material down her luscious legs and kicked it off by her feet.
There she was, completely naked while sitting next to me. From my angle I could just see her pelvis, but her legs were closed, making it so I couldn't see her sex hole.
Slowly, Grace parted her legs until her knee hit the gear stick in the middle. Fuck, I still couldn't see between her legs.
I couldn't believe that my 18 years old full-bodied sister was completely naked with her legs spread next to me.
"Mmm." She mewed in a high pitched, hushed voice.
I turned my head, and my eyes nearly burst from my skull when I saw her right hand between her legs, moving slowly!
"What?" Grace said in a cheeky voice. "You told me to finger myself."
Her hand was moving around, clearly circling her clit. I could only imagine the beauty of her lips moistening with every passing second.
A car overtook us, and I watched the man in the passenger seat looking into our car. His face turned from regular to shocked and then to a smile, which made me laugh. To my side, Grace was smiling at him, using her right hand to massage her clit while her left played with her left breast.
Grace's high pitched quiet moans mixed with her heavy breathing, sending me wild. My car was quickly heating up as her passenger window began to fog up.
"But right now," Grace whispered and bit her thick, bottom lip, "I'm just rubbing my clit... this is fingering myself."
Her left foot went onto the dashboard. I saw her perfect, smooth foot with pink painted nails. Her left knee bent as my eyes worked their way down her thigh. I still couldn't directly see her pussy, but I saw two fingers press inside of her.
"Mmm, that's better." Grace moaned.
A car on our left beeped, and we both jumped, but Grace didn't stop.
"I guess you are a slut." I whispered with a grin.
"I guess I am." Grace replied.
Her two fingers moved in and out of her hole, and I could see her bare foot moving in circles as she fingered herself. From the corner of my eye, I could see Grace's large chest heaving up and down as her pleasure grew.
My own cock was at an awkward angle, so I lifted myself up from my seat to reposition it to facing up, and this got Grace's attention.
"Does watching your sister finger herself get you hard?" Grace asked.
"Why don't you find out for yourself?" I replied cockily.
How wrong this situation was only made it hotter.
Grace's thin fingers left her little hole, and they glistened in the sunlight before she sat upright again. Her breasts bounced with her movement as she turned towards me.
Her right leg went underneath her, her right knee pressing against the back of the seat as her left foot went back onto the ground of the car.
I turned my head and gasped... finally, I saw it. And it was hypnotic. I had seen a few girl's pussy in my time, but none were like Grace's. She had lips that were perfectly placed, as smooth as they could be, and moist from her own juices. My mouth drooled at the sight, and the thought of even touching her sent me wild.
That distracted me until Grace's hands grabbed onto my belt.
"Woah!" I shouted.
"What, you told me to find out?" She said in a girly, playful tone.
I expected her to simply grab my shaft, not to take it out, but I wasn't going to refuse her.
Grace easily undid my belt, and her fingers went to my zipper. As she pulled it down, I lifted my arse from the chair, and Grace grabbed onto my jeans and pulled them down.
