My family rented a beach house in North Carolina near the section where you can drive 4 wheel drive vehicles for a 10 mile stretch. This let's people get away from the crowds. We went with my parents, aunt and uncle and cousins in 2 Jeeps. After a while half the family went home. When the rest of us loaded our Jeep up with coolers and stuff we ran out of seats.
My aunt was left outside.but she just said she could sit on my lap if I didn't mind cause its only a ten minute ride.
Well, she is like 35 and I was 17. Even though she is older she has a really nice body cause she euns and does weights a lot. I had checked her out all afternoon in her bikini. She is like 5'4", probably 120 and I'd guess at least c cups with light brown hair and blue eyes. She hopped onto my lap in the back seat. My sister was there too but we coolers, towels and umbrellas stacked between us.
So right when aunt rebecca hoppes onto my lap and wiggled a bit to get comfortable, I started to get hard. A little at first, but when we started to drive in the bumpy sand her butt was bouncing up and down and rubbing me. I got really hard fast. Plus, sitting on my lap her tits were inches from my face and sometimes rubbed against my arm and neck. I was really embarrassed cause I figured she must feel my hard cock pressing against her ass in her bikini. At one point we got jostled enough that her bikini bottom sort of got slid down a few inches in the back and I could see down the crack of her ass and then my cock starts throbbing. She reached back to get stable and her hand landed right on the shaft of my cock but on top of my trunks. I started coming and could not help it. I am sure she must have felt the twitching and throbbing but she never said anything then or later. When we got out I grabbed a towel to hide my wet spot.