Earlier this year Gabby and I sold our house which was larger than we need and bought a Docks apartment. It is on the top floor facing an old dock with a similar building opposite. What attracted us were the floor to ceiling windows, doors from the bedroom and lounge leading out to a balcony. The direction of the rooms means that at certain times the sun shines in to these rooms so Gabby has moved the large double bed near the window. We are both in our late 40's, have kept fit and slim. Gabby has blondish streaked hair, good legs, flat stomach and 34" tits. Her pussy is completely smooth having had all her body hair permanently removed a couple of years ago. Gabby likes me smooth and I shave my cock and balls. At weekends and in the evenings we often go naked. Gabby loves the sun and sex and will often lie on the bed while I massage her or she will play with her self while I watch. She has a large collection of sex toys and will spend 2 or 3 hours just teasing her clit and sensitive nipples as she has several orgasms. We usually finish by having a long slow fuck or me standing over her stroking my cock until I cum on her, which she rubs in saying it's good for the skin. At night we sometimes fuck with her bent over the balcony rail watching people passing below. One morning, not long after we moved in, I noticed the sun glinting off something in the window opposite. I fetched my camera, which has a decent zoom and had look and took a few photos. When I downloaded them and blew them up I could see there was a telescope or large camera lens pointing directly at our apartment. I called Gabby for a look and she just said "Oh this'll be fun we've got a voyeur". After that she would stand naked in the windows, which because of the layout, were only visible from that apartment, and rub her tits, masturbate or give me a blow job. From the even more exhibitionist behaviour the person must have guessed that we knew and when I got home one day Gabby said "Guess what, I've met the voyeur. Her name is Sam she talked with me in the cafe this morning. She loves our shows and has invited us to dinner on Saturday. Do you want to go?" "Why not" I said. Gabby visited Sam a couple of times before Saturday and described her as being in her mid 30's, dark long hair, biggish tits, a pert bum and sexy. Saturday arrived and Gabby wore a wrapover dress and matching bra and panties, i just wore a polo shirt, trouser and slip on shoes. We arrived at the apartment and Sam opened the door. She's about 5'6", wearing high heels and a short mini dress which just reached the tops of her gorgeous legs. She kissed Gabby full on the lips and me on both checks and invited us in. The first thing I noticed was the huge TV screen and on it was playing pictures of me and Gabby having sex in our apartment. She could see me watching and said "Good isn't it. Gabby's already seen it. Have a look at my cameras over there" I bent to look through the viewfinder and had a perfect view of our apartment. I could feel her hand on my back and Gabby beside me and as I straightened they both grabbed my arms. Gabby said "Come on you have to see the bedroom" and led me there. This was a first for me, ropes on the bed, handcuffs, and on the walls metal rings. They dragged me in, not with much resistance, Gabby pulled my shirt over my head and Sam got down and removed my other clothing before leading be to the wall where they tied me to the rings. Sam removed her dress and all she had on underneath was a leather harness, leaving her pierced nipples exposed, with straps between her legs where I could see her clit was also pierced and a rows of 3 rings piercing her labia. Gabby stripped and was given a similar harness except hers covered the front of her pussy. They then got to work on me, sucking and nibbling my nipples, stroking my cock and running there fingers between my legs and teasing by bum. They were kissing each other and while my cock was being wanked sucked each others tits and fingered there pussies before kneeling and taking it in turns to suck my cock speeding up and slowing down prolonging the moment when I came which when I did they aimed at their faces licking it off each other. Leaving me tied they went to the bed and Sam lay on her back as Gabby got down between and performed cunnilingus on her. They kissed and brought each other to orgasms using their tongues, fingers, vibrators. Gabby then reached for a Dildo on the side of the bed and attached it to the front of the harness. Sam was bending over the bed and as I watched Gabby ran the dildo along Sam's pussy before parting her with her fingers and pushing the dildo into her cunt. By now I was fully erect as I watched her fucking Sam on the bed as Sam screamed out she was coming She fucked her faster and rammed it in harder until with a shout Sam went rigid and fell to the bed. Gabby walked over to me, and said "I can see your ready for more" and untied me, leading me back to the bed. "It's your turn to fuck Sam" She rolled on to her back and I slid my prick into to her. she hadn't recovered and was soon bucking beneath me as Gabby kissed her and stroked her tits until she came again. I still had my cock in her cunt and she said I want you in my mouth so I withdrew and turned round and started licking her pussy as she put her lips round my prick and sucked. Gabby was behind me cupping and squeezing my ballS, I felt her pouring something on my bum then working a finger into my arse. Sam stopped sucking and said" Gabby get behind him and fuck his arse" before taking me back in her mouth. I felt Gabby kneel on the bed behind me and add a bit more lube as she pressed the dildo against my arsehole. It was tight but slowly she eased it into to me, then holding my hips started to fuck me. The sensations were, incredible, unbearable, My cock being sucked and my arse filled at the same time. I could feel my cock starting to twitch in Sams mouth as she sucked harder and I came. Gabby fell forward and kissed my neck before slowly withdrawing the dildo out of me. We slept for a few hours before I fucked them both before we left in the early hours. Since then we met every week and Gabby sees her even more frequently and then tells me about as we fuck on our beds as Sam watches on her video on the other side of the dock.