This is fiction!
My Sister-in Law (Debbie) is now on her own, her husband left her for the usual younger, slimmer woman and she has been devastated by the experience. My wife (Julie) and Debbie are very close and we have been spending a lot of time with her to help her get over the bad experience and give her back some of her self-esteem and confidence.
A few weeks back she was over at our house for dinner, she doesn't normally drink as she drives but on this occasion she was staying over as the girls were going out the following morning so it all made sense.
Over dinner we were on our fourth bottle of wine so the conversation flowed fairly easily and inhibitions were relaxed shall we say.
I asked Debbie what she was doing for sex now that she had been on her own for a few months, she coyly replied that she'd resorted to a fingers in approach which made us all laugh.
She went on to say that she was jealous of our relationship and that she'd do anything to be part of a relationship like ours.
What Julie said next made my cock twitch and sit up straight, she said to Debbie "Well ask if you want to be part of our relationship, we have a king-size bed so there's plenty of room".
The room went very quiet and we sipped at our wine, eventually Debbie looked at me, then at Julie and said "Well if that's an invitation then I'd like to take you up on it."
At this I stood up and stood behind Julie, my arms over her shoulders so I could fondle her large tits, looked at Debbie and said "You'd be very welcome but things will only happen if we are a threesome."
With that I undid the buttons on Julies top and exposed her tits to the room, rolling her large erect nipples between my fingers, pulling them out, stretching them and making them harder than they were already.
Debbie had even bigger tits and she undid her top and started to rub her own nipples, she came and sat next to Julie and I reached over and started to play with her tits, one hand on each of the sisters' tits, I was in heaven.
Julie reached behind her and grabbed my cock which was harder than it had been for a very long time, she gave it a squeeze and suggested we retired to the bedroom.
Julie led the way followed by her sister and I brought up the rear so to speak.
They both sat on the edge of the bed and looked a little nervous, we had never done anything like this before. I stood in front of them both and slowly unzipped my trousers and stepped out of them. I tend not to wear underwear around the house so my cock was standing to attention in front of their faces.
Julie gently took it in her hand and stroked me, pulling my foreskin back, I'm reasonably proud of my cock, not massive by any means but about 8 inches long with a girth of 6½ inches and some great veins. She angled my cock towards Debbie and said "Go ahead and suck him".
Debbie leaned forward and licked the underside of my cock, swirled her tongue around it and then slowly lowered her head taking my length to the back to her throat. She looked up at me and then pushed on until my balls were resting on her chin and she had my length lodged in her throat.
Julie said "Well you can get more in your mouth than I can" and with that she started to roll my balls in her hand, Debbie started humming and her throat started to vibrate against my cock, I'd never felt anything like that before.
Debbie then released my cock and Julie sucked down on it releasing a load of spit making my balls wet. Debbie took over working on my balls and then she pushed her hand further back and I felt her finger start to rub my arse. With all the slimy spit it wasn't long before her finger was inside of me up to her second knuckle.