I couldn’t sneak away as I still needed my gym bag. I stepped out of the shadows and they saw me. Derek was surprised but Cindy just smiled. “Been...watching long?” she asked “just long enough” I said “now I know why the German Shepard learned to lick so quickly”. Cindy introduced me to Derek who was still standing there somewhat surprised. It was a little difficult for him to remain calm standing there naked with his cock at half-mast. “Umm hello Beth” he said “it is a bit embarrassing to meet. What the intelligence community used to call a ‘dead letter box’ until all that sort of stuff got unfashionable. You hide what ever it is there, leave a pre-arranged signal, we pick it up. Nobody needs to meet. Each side takes care that they aren’t being watched and the whole thing goes off nicely.“So, if I could get you a list of the devices, say?”“There’s a telephone box at the end of this road. Act as though you are making a call. Push an envelope behind the phone. If you look on the back. Helen had her mouth open now and her tongue was running along her top lip as Ben slid his hands further down, pushing the top of her costume as he went. The whole of my wife's breasts were now exposed in front of my friends as Ben pinched her nipples between his thumb and finger making her squeal. Having her nipples played with was not the only reason Helen had squealed, Andy had slid the crotch of her costume to one side and was obviously running a finger along her slit. Her hips were making. “I want to see you fuck this bitch like you fucked me.”I looked at Elizabeth, to see if she was okay with what was about to happen. She smiled a beguiling smile and then, after proffering a very pronounced wink, she nodded her head in approval.I instructed her to straddle me and she willingly complied, pressing the head of my cock into the swollen folds of her moistened vagina as she settled down on top of me, straddling my hips. As she did, Rachel straddled me, only she was facing Elizabeth..