Learning to drive a big-rig (part 1)

I'm Zoe. I'm 18 and just graduated high school. I have no plans to go to college as I'm wanting to join the family business and drive trucks.
I've been told my whole life that I'm too little being only 5 foot and weighing 110. But I've never backed down from a challenge. But I begged and begged my dad to teach me.
My dad is huge at 6'4" and 235.
I spent 2 days learning the inside of the truck, the gears, the buttons, the computers. How to keep the sleeper cool and clutter free. The family especially my brothers teased me terribly about sleeping in a box or that dad would use me as a pillow or hang me from the rear view mirror.
The next morning dad and I headed out for a week long haul across the country.
Dad would let me drive but only during the day and that meant we had to sleep at night and share the sleeper.
The first night I had pulled us into a rest area. He went and showered first then when he came back to the truck he told me he would go with me because there were some men hanging out near the showers.
I grabbed my bag and followed daddy.
I went inside and showered and washed my hair. I dried off but realized I left my bra in the truck. So I put my shirt on anyways. Thinking my titties were small enough that no one would notice. I'm only a 32B.
When I walked out my daddy smiled and he looked me up and down. I never felt self conscious but I did now. When we got back to the truck I crawled up and daddy placed his hands on my ass cheeks and pushed me into the truck. He laughed and teased me about hanging me on the mirror.
"Haha daddy. Not funny" I fumed.
"What's wrong little bit?" He asked as he plopped down in the seat.
"I'm not all that little daddy. I'm grown. I just want to be treated like I am" I hissed.
Daddy smiled and grabbed his tablet so we could FaceTime with mom.
We talked and daddy told mom that I did really good. That they were about to hit the sleeper soon.
I blew mom a kiss and crawled into the sleeper. I laid propped up finishing the drive log from today.
Daddy locked the doors and then opened the curtain. He scratched his chin and asked "how are we going to work this little bit?"
The sleeper is a full size mattress with storage underneath.
I told him I usually fall asleep on my right side, he said he did too. So I would sleep on the side and he would sleep on the sleeper wall side.
We crawled and got situated and I put my ear buds in.
"Good night daddy" I said a daddy clicked off the lights. The hum of the engine was relaxing but I couldn't fall asleep. I was still excited about finally being out on the road.
I felt daddy toys and turn. I tried to stay as still and as small as I could but we still managed to touch each other.
I heard daddy start breathing heavy and I knew he was asleep. I tried. I tried but I wasn't too comfortable hanging off the edge of the mattress.
I slowly slid my hips backwards. I inched slowly as I could as I didn't want to wake daddy.
I felt daddy's hand move to my hip. I froze. Then I felt daddy pull my hips backwards until my ass cheeks touched his cock.
Daddy was hard! Rock hard and long and thick. I froze not sure what to do.
I couldn't tell if daddy was still asleep. I tried to slide back to the edge of the mattress but daddy held my hips. I gave in and convinced myself that he was sleeping. I began to relax.
As I was falling asleep I felt daddy's hips begin to move.
"You're humping me!" I thought to myself. I could feel daddy's cock pressing into my ass cheeks and lower back.
I coughed in hopes of waking him up so he would realize what he was doing.
It didn't. He kept moving his cock against my back. He moved his fingers from my hip across my stomach and under my shirt.
I was beginning to panic. I tried to think of what was happening. I convinced myself daddy was thinking I'm mom.
I slowly moved my hand on to his hand and tried to move his hand from my stomach.
My hand was so small that I couldn't wrap my fingers around his wrist. So I grabbed his finger and pulled it. But daddy moved his hand up my shirt to my titties.
I inhaled sharply. I've never had a guy touch my titties before. I'm gay. I've only hooked up with females. Daddy's rough hand and the weight of it caused my nipples to become hard and elongated.
I laid still. My mind was racing. "What the fuck? Wait. He's dreaming. Right? Yeah yeah he's dreaming". I thought. But as I started to sit up daddy moved his fingers and began pinching my nipple and pulling it tight.
I heard a moan escape my lips. I was breathing heavy and realized my pussy was getting wet.
"what the fuck Z?" I asked myself.
But then daddy moved his mouth to my neck. I felt my whole body react as daddy's mouth was nuzzling against my ear. His hot breath was causing my body to become covered with goosebumps. Daddy moaned as my nipples became longer and harder.
I tried to speak but my mouth was too dry.
I moved my hand to his finger again to try to move his hand from my nipple.
He moved his hand before I could grab his finger. Daddy slid his hand down over my stomach and into my shorts.
Daddy moved his hand in my shorts and his fingers separated my pussy lips. His finger slipped against my clit. His rough thick finger slid over and over.
I gasped as I was so close to cumming. My body didn't care that this feeling was coming from my daddy.
Daddy shifted and he moved his other arm under me and that hand grabbed my tittie.
"Dad, daddy. Are you awake?" I stuttered.
Daddy moved his mouth to my ear and growled "mmmmmm" then his tongue licked my ear and down my neck. He sucked my skin which caused me to moan and my pussy throb.
"Oh God. Oh. Daddy..... ugh" I moaned as my pussy throbbed and I felt pussy juice gush out of my tight pussy.
Daddy moved his finger from my clit and into my pussy. Only his fingertip smeared my pussy juice all over my pussy.
Daddy stilled himself briefly before he pulled his hand from my shorts and he rolled over to face the wall.
I laid still. I was confused. "What just happened? Was he asleep? Did he seriously just get his little girl off?" I thought to myself.
I fell asleep soon after my cumming.