As we walked to the plane with our baggage, the fuel truck was still topping off the tanks of the G5LR.My pilot Vance and co-pilot Josh were double ch...cking the refueling operation. They wanted to make sure every drop was being put in the tanks that could be squeezed into them; they wanted to make sure that the tanks were filled to cap. This trip was pushing the G5LR to its extreme – we were trying to go seven thousand miles without refueling. When they were satisfied they helped us with our. I got up and went outside to find a two girls, one on her ass against the ambulance, hence the bang, and her friend throwing up against a tree.'What's going on', I asked the girl now wiping her mouth, 'Can you look after my friend', she said drunkenly, 'she has had too much to drink', she continued.'Can't you take her home', I asked as I bent down and turned her face up to see her, but her friend was staggering off, to be met by a boy, no doubt going for a shag, I thought angrily.I struggled. That was awesome, I thought, who knew my sister's pussy is so good. My cock was still hard and throbbing, that's when I heard. "You are a little pervert; you just fucked your sister!" I looked up to see Velta, she had watched the whole thing."That was the hottest, freakiest, nastiest thing I ever saw," she said throatily. When I looked closer she was leaned against the wall with three fingers shoved in her pussy. She was finger fucking herself while she watched me fuck my sister."I waited till. Although I was intending to start slowly, M put her hands on my ass and pulled me into her. "Fuck me! You can cum inside me now. Fuck me until you cum."I started to pick the pace up, thrusting harder and harder. Our bodies were slapping together as I increased my speed. I knew I wouldn't last long and, selfishly, I was looking forward to exploding inside M without a condom for the first time in almost two years. And explode I did! I've no idea how many shots I fired but it was a lot and it was.