I had known Sarah and Greg for a while, with meetings every few months after I answered their ad in a contact mag. They were a very loving couple, Sarah adored him and Greg worshipped her, but they had a problem. Greg liked being submissive and Sarah was naturally very sub too, so they needed a bullish guy to be dominant with them both, and I was happy to do that for them. Sarah has green eyes, a pretty face, natural blonde hair and a slim, boyish figure. She seems shy, but underneath that façade she's a demanding, sexy animal. Greg has an athletic body and is very fit. He tried to keep her happy, but he had realised that he couldn't do enough for her and needed help. After a few meetings we had discussed many of our likes and dislikes, and I realised that Sarah wanted to try everything - twice at least. She had confided in me that she enjoyed being spanked but she had never told Greg, and asked me to tell him to warm her bottom while I watched. Our next meeting was in a smart hotel, and we had a drink in the bar followed by dinner in the main restaurant, with the intention of sexy play afterwards. Sarah looked very smart in a straight skirt and a thin shiny top which made it obvious she wasn't wearing a bra, something she knew would please me. During dinner I made her pull up her skirt to show she was wearing stockings and suspenders but wasn't wearing knickers, just as I had instructed her. I then told her sit with her skirt bunched up around her hips. Greg was embarrassed by his wife's willingness to obey me and display herself, so when the waiter tried to see I told her to make sure he got a good look. Greg groaned, knowing that she would obey me, and when the waiter next came to our table Sarah opened her legs at just the right moment for him to get a good view of her stocking tops and bare pussy. He smiled and looked at Greg, who was obviously her partner. She told us that flashing to him had made her very wet, so I told her to slip a finger inside her and show us. As she brought her hand above the table, I told Greg to kiss her hand and lick her finger clean, which he did. We were far enough away from other diners for nobody else to have seen, but after he had done it I asked if he enjoyed obeying me. He was embarrassed and humiliated, so I made him tell his wife that he would do whatever I told him to. After the meal we went to our suite, and I sent Greg to his room to fetch the things I had told him to bring from home. In the past, Greg had enjoyed having his wrists tied behind his back while he watched his wife and I having sex, him standing with his hard cock on display but unable to touch it. To add to his discomfort, I had made him buy a new toy, a cock harness which had four straps around his cock, a strap around his balls and a strap around his waist which made his cock stand up hard against his stomach. When he returned I made him undress, leaving him naked with Sarah and I still fully dressed. I told him to unwrap the new toy, and before he could get fully hard I tightened the straps around his cock and balls, then used some cord he had brought to secure his wrists behind his back. I turned to Sarah and told her to kiss me. She put her arms around my neck, pressed her body into mine and we snogged for a few minutes, mouths open and tongues everywhere. I knew this would get Greg hard, and when we broke our kiss, his cock was straining at the straps which were now very tight. I then told Sarah to tie the last strap around his waist, which pulled his hard cock firmly up against his stomach. I could tell the straps around his cock were hurting, and I knew Sarah would want to loosen them for him, so I told her to leave him to suffer a bit. I then made Sarah stand in front of me while I undressed her, she always enjoyed me taking my time to strip her, and I knew Greg found it difficult to see me playing with her breasts, so I fondled them and played with her nipples, making them hard and tight. When Sarah was standing in just her stocking and suspenders, I could see her juices seeping from her slit. I told her she was a dirty girl and my slut, and she hung her head in shame. I knew she would be very excited, and I told her I was going to make her come. She mumbled 'yes Sir', and opened her legs without me telling her. I slid two fingers gently into her, then used my thumb to tease her clit. She started to moan and within a minute she cried out as she came, her juices flooding out over my hand. I held her as her legs gave way, and she flopped back onto the bed. I wiped my sopping wet hand on Greg's body then told him to lick my fingers clean, which he did. Sarah had recovered from her come, and now, with her bottom on the edge of the bed, she lifted her legs right up to offer her pussy to me. I teased her and made her tell me out loud in front of her husband that she was my slut and that she wanted my cock. part 2 to follow