Sarah pushed on my bum as if to indicate what she though the next move would be. I could sense Sam's tension. I knew if I went inside her it wouldn't ...ake me long to cum as I was so close to the edge already. But who could resist. I felt Sarah's hand reach round to my balls, gently stroking them. I looked to her and she nodded at me, glancing down to her sister's ass. 'Do it', she mouthed.I pushed in. And in. Sam put her head back in the pillow. I was balls deep in Sam's tight ass. Fuck, this. It wasn't long before we were playing with each other's tits and pussy and doing a lot of kissing. As we kept going, we knew we were making the other one very horny, finally, Lisa asked if I had any lubricant, I said yes but I was pretty sure I was wet enough for what we were doing. She gave me an impish smile and said "you wanted me to fist you and now I want you to fist me, let's do it."Thank the gods, I did fisting as a teen with my girlfriends but really not for over ten years. I just. So far there wasn't a radar beam coming down at me, so if I stayed low I wouldn't be detected by the ground-based systems. I'd stand out like a searchlight if a radar emitter got above me and radiated down, in which case my plan was to stop as quickly as possible to pretend to be a stationary car. Or a stationary truck or stationary combine harvester. I wasn't proud; I didn't care what I was mistaken for. I was reasonably sure that the look-down radar systems used by combat planes would be set. Finally, I feel his length fully fill me. He hisses and I sigh. If my eyes weren’t already rolled to the back of my head, they are now. He pulses against my G-spot and I involuntarily keel. I don’t care who hears me. The feeling is so powerful. I can never get enough of this. This is where I want to be. Why do I have to leave? I tilt back, so I can feel as much of him pressed against me as I can. I feel his hands on my hips, guiding me as we move. I want to ride him, but he hold me back,.