I wasn't sure what it was exactly about it that got under my skin [no pun intended]. I loved sex. All kinds of sex. We'd had fun in lots of experim...ntal ways; Role Play, Threesomes, Online Voyeurism, Same room sex, Soft swinging, BDSM....lots of ideas and at one point we'd laughed and listed ourselves as 'tri-sexuals' on our swinging profile - claiming we would try anything once.When it came to this idea of group sex however, Dan and I had got hot and heavy and extremely turned on both. ...we like to get together now and then” he explained. “So not girlfriend material?” I asked sarcastically. “No, Lacey girl....I don’t know if I’ll ever settle down. I like my life the way it is....less complicated”“That’s understandable”, I agreed, nodding. “So....about tonight. Did you like watching? Uncle Steve asked, searching my face for a reaction. “I did” I said shyly. Avoiding uncle Steve’s eyes and looking down at the duvet cover on the bed “I thought you might like to watch” he. Most of them had been pulled out of the Infantry APC training (Armored Personnel Carriers) and stuck into these big boy 50 ton tanks. Now, that might work for, say, a driver; the gears were similar, the concept was the same and you could always make a weight and size adjustment. It did not work well for Gunners, Loaders, and Tank Commanders. I had spent years filling all these positions and was kind of knowledgeable about the nuances of getting tanks into combat mode.Officers tended to consider. I thought to myself that tonight could be my lucky night. We ate dinner and went to mother’s room. Her bed was not too big, just big enough for 2 people. I went and lied on the right side and my mother shut off the light and came on my left. We said goodnight and now I was waiting for her to fall sleep. After half hour or so I thought she must be sleep my now. I turned towards her and she was facing the other way. I put my hands on her legs and slowly started to rub her thighs on top of her.