My sister and me got a ride home from school over and Christmas break with a married couple we met at school. It was a cheap way to get home to see the parents and a fun way to go.
Dan's car wasn't to new that was for sure but it ran good and was cheap on gas, his wife Jan was 3 months pregnant and a real joker to ride with and had us all cracking up the whole way home.
After the break we were going back but Dan's parents were sending a baby crib back with them and with the trunk already full that left only 3 seats to fit the crib in the car. I teased Dan that his wife could ride the 14 hours on my lap and he didn't see the humor in it saying I could ride on the roof if I wanted but his wife was going in front with him. I didn't push it cause I could see he was very protective of his wife.
After we started back with my sister and me trying to share a single seat we could see it wasn't going to work and she would have to sit on my lap on the trip back. I didn't mind having her on my lap after all she is one hell of a sexy chick even if she is my sister.
I wish she had worn something other than a short skirt cause having her on top of me and most of her thighs bare started to get me going. I think any guy would react to having a 23 year old green eyed red head on his lap wouldn't he?
After maybe a half hour of having her grind her sexy ass on my lap I was hard as a rock and she leaned back and said "If you plan on pushing that thing into my ass that way you're going to make me cum in my panties."
So I wasn't the only one getting turned on here. I started pushing up just to see if I could make my sis orgasm without actually fucking her. It wasn't like we ever had sex with each other, I mean sure we give each other hugs and tiny kisses before but nothing sexual.
She put her head against the back of Dan's seat and was meeting my pumping. I could feel little shudders going through her body when Dan said "We need gas and we may have a problem."
Well it turned out the alternator had packed it in and we had to get a room. I say a room cause for one thing it was all we could afford and the town was packed for new years the next night. My sis said "Dam 5 more minutes and I would have cum all over your lap, your being bad with your old sister you horny bastard." Once we had a tiny bit of alone time.
I thought me horny, she was the one coming on my lap even if I was getting close to coming in my pants as well. And what did she mean old sister hell she's only 14 months older then I am.
The only room we could get was a room with two double beds so I said "Well Dan you better stay on your side of the bed and NO spooning."
Dan said "What's it to you if I spoon with my wife cause I'm not sleeping with you asshole, I'm sleeping with my wife." I looked at my sis and she had a goofy looking grim on her face as she winked at me.
We went and got something to eat and picked up some cokes with a cheap bottle of rum to take back to the room with us. We didn't get drunk just feeling good when we decided it was bed time.
The women went into the bathroom to change for bed as Dan and me stripped to our jockeys and got in bed. There was enough light coming through the window that I could make out that my sister had a long t-shirt on and Jan had a sexy baby doll nighty on. Seeing them like that made my third leg stir again.
After they got in bed Dan and Jan started fooling around and I felt my sister put her hand on my hip and whispered into my ear "Hearing those two makes me want to finish what we started in the car, doesn't it make you too?"
I turned to her and if I had ever seen desire in anyone's eyes before I sure seen it in my sister's eyes as she moved forward to kiss me and not like a sister either.
I said "But your my sister and we shouldn't be." that's all I got out before she pushed her tongue deep in my mouth.
By now she had her hand inside my shorts and had me just as hard as I had been in the car, when she ducted her head under the covers and took me in her mouth I knew there was no stopping what was about to happen.