My two female companions and I were actually going to Europe to visit an artists commune that was famous for its open sexuality lifestyle. Liz fell asleep and Linda asked me to come with her to one of the lavatories in order to join the Mile High Club. We got naked almost immediately. She positioned herself over the toilet, on her knees, facing the wall, holding on as the ride got bumpy — if you know what I mean!
So I’m able to poke away from behind at my favorite wet spot, masturbate her, and have my other hand full of her ample tits. We always worked well together and both had simultaneous orgasms.
We crept back to our seats and didn’t say a thing to Liz. Later, at the commune, I had ample opportunity to fill Liz in — if you know what I mean — and I think you do!