" What have you in mind?" asked Helen."I want to see if he can fuck all four of us in one session," giggled Mandy. "We will have great fun with each o...her but with the bonus that there will be a cock to fuck at the same time." But Frank is your Grandfather!" exclaimed Sue."He's fucked me before," said Mandy seriously. "So I will need a solemn promise from you all that anything that Frank and I do together sexually will be a total secret. Do you all agree?" Yes we do," said all three girls,. "I couldn't imagine what she had in mind, but something new sounded fine to me, as long as it involved sex with Andie."What do you mean?" I asked."I want you to fuck me in the ass," she said.It sounded like a great idea to me. But with a hot mouth wrapped around the head of my cock, any idea would have probably sounded okay. I was in no mood to argue. Getting your cock sucked is always better than nearly anything else I could think of, but sometimes I wanted something more. Maybe just more body. When all the passengers were secure, Chuck led us out of town and across the countryside to the Avon Park bombing range just north of Sebring. We landed near some tents that were set up for the visitors to sit under while we demonstrated the vehicles.First, all of the vehicles drove over hazards and very rough terrain, increasing speeds until the trucks were bouncing five and six feet off the ground.We showed off the tracked vehicle by having it climb near straight up and then go straight down.. Your hand slippery from the oil slowly encircling me and teasing my skin in short movements up and down, smoothing me flat and exposing the head as you pull on my skin towards the base, then reversing and pushing the skin back to cover my now hard cock in a sensual and slippery massage. Back and forth you work your hand, my breathing matching the slow rhythm of your motions. Your eyes locked on my cock and you gently biting your lip as you watch. Your hand slows and stops, keeping contact but.