Wifey and I have had a couple of 3somes in the past with a friend of hers (FFM). This past weekend, her step sister came down from NY to visit. She's pretty good looking, she actually looks a lot like my wife. We go out on Friday night, the 2 of them got all dolled up and looked VERY hot IMO. They get liquored up and sister starts bitching about how much her husband sucks in bed and how she's not attracted to him anymore, etc. My wife starts bragging about how great our sex life and marriage are. Sis is jealous, says she wishes she had a husband like me who was attentive to her needs. She then starts flirting with me pretty heavy. I'm like and do NOT want to do anything to piss off my wife so I kinda just stay cool about the whole thing. Sis wants to dance with me, wife laughs and says go for it (she's not the jealous type thankfully) so we hit the dance floor. Sis is literally grinding her pussy into my leg so hard she almost knocked me down. Wife joins us on the floor and the 3 of us dance for a while with me in the middle trying desperately hard to conceal my raging boner. We finally leave the bar and go back to our house. Wife and sister want me to fire up the hot tub (where many an interesting evening have started) so I of course oblige. Drinks keep flowing, the girls don bikini's and hop in the tub. I jump in and sit across from them trying not to let my imagination run away with me and not get my hopes up of what I wished would happen. Sis starts talking about how much she loves sex, how she's had 3somes in the past and LOVED them, etc. She then again tells my wife how lucky she is to have me and how she (sis) wishes she had a husband who was into things the same way she is. My wife looks at her and says "ya know what sis, I love ya so much I'd even share my husband with you!" I was like :eek2:, sis was like and wifey was like . I asked my wife if she was serious and she said yes. Sis asked her if she was serious and she said yes. I said "so it wouldn't bother you if I did this?" and proceeded to pull sis's bikini off and start playing with her titties. She laughed again and said "only if you play with mine too", then whipped off her bikini. Wound up fooling around with both of them in the tub for a while, then took the party upstairs to bedroom. Wow, what an incredible night! The one rule my wife has is no penetration with other women to which I happily obliged so I spent most of the time fingering sis or doing oral on her while fucking my wife. The visual I can't get out of my head is me facing my wife fucking her while I had 3 fingers in her sister and the 2 of them were making out. I never in a million years thought my wife would be into that with her sister but when we talked about it afterwards she told me that it was the most comfortable she's ever been in a threesome. Sis was TOTALLY cool with it the next and only asked that we not tell her husband. Can't wait for her to come visit again!!!