1st Sgt Gibbs showed up early and was heckling me while I was still sweeping.“Look at you, can’t even push a broom right.”I stopped and looked a... him, there were a couple more comments before I’d decided I’d had it.“Care to come over here and show me how it’s done?”Without a word he turned around and left the warehouse. It was about 20 minutes later when it was time to go and begin my demise. I clocked out and went to the truck. 1st Sgt Gibbs leant against it with a grin on his face waiting for. I then heard some giggling and dad say something like " go on love lets see your tits".Then mum tell him " I will show you more than that you randy bugger" and dad asking her to " put on one of the videos love" or something like that.I then heard drawers opening and the sound of their video machine whirring and then a humming noise, something like a swarm of bees!Obviously it was mum getting her vibrator out and switching it on.I then heard them go at it for ages, dad encouraging her to ". I could only see him but he was laid back and looked to be enjoying himself and every so often I would see the top of her head.At this point neither of us were watching the screen, instead we were both intently focused on the show in the car next to us. After a few minutes the girl raised up and I figured that he had cum, instead she slid onto his lap and began to slowly ride him. My cock was throbbing. I heard Brittany softly moan.“Wow, I didn’t think people actually did that at drive-in’s.” I. I was shocked and asked the whereabouts of my friend, she replied harshly saying wrong no. I cut the phone and checked the no. It was wrong no. I felt guilty. After about 3 days, I called da same no. again in da eve. She lifted the call and again asked who is this? I said I am the person who called her 3 days ago, and said sorry as I unknowingly typed the wrong no, and stuff. She said OK and slowly I introduced myself and asked her name and all. She replied positively. We talked for some time.