I run a small plumbing business with my business partner Linroy . Usually it’s only the two of us but we make a living ! About 8 months ago my wife Sarah asked me if I could fit her sisters new en-suite bathroom . Although I do not like my sister in law as she is a snob I couldn’t refuse ! So I said I would pop in the next day to check what was required. I arrange with Debbie my sister in law to call around at about 12 noon . Her husband has his own import business and they live in a nice detached house in a good area unlike us. My wife had told me Debbie had an affair recently as James her husband suffers from erectile disfunction! Debbie greeted me at the door dressed in an rather expensive looking dress . She said she was going to meet a friend for lunch . Although a size 18 And in her mid fifties she was still a very sexy looking woman with large breasts Short red hair and great legs She goes to the gym regularly so is quite toned . I check what fittings were required as the new shower and sanitary ware has already been delivered . We arrange that I would start on the following Monday . Business has been a bit quiet so Linroy was going to help me . On Monday we arrived at the house at 8 am and Debbie opened the door in her dressing gown She made us a coffee and said she was going to shower . As we were carry our tools and fittings up to the en-suite Debbie came out of the main bathroom with just a towel wrapped around her and went into her bedroom drawer to get her underwear ! I could see that my mate Linroy already had a hard on and I warned him to behave as it was my sister in law ! Linroy is Jamaican and is pussy mad and has a thing for mature housewives . Debbie had gone out and I left Linroy to carry on while I went to give another client an estimate . And to finish another small job nearby . I returned a few hours later and let myself in with the spare key Debbie had given me . As I headed up stairs I heard noises , not work noise but sex noises ! I crept upstairs and the bedroom door was slightly ajar . There was Debbie on her knees naked sucking Linroy’s big black cock ! I was unsure if I should quietly creep back out but curiosity got the better of me and I had a bird’s eye view of my sister in law naked sucking black cock ! Debbies large breasts were bouncing as she sucked and I could see her lovely shaven pussy There was a lot of laughter and Linroy got Debbie to climb on to bed on all fours and I got a great look at her pussy She moaned loudly as he slid his cock into her ! By now I had my own cock out to play with and it was rock hard ! Linroy was pounding Debbies pussy hard & fast and she was obviously enjoying judging by her loud moans. I accidentally coughed and Linroy looked around and saw me ! He had a big grin on his face and he gestured for me to come in . Debbie could not have heard as she continues to moan loudly . I didn’t know what to do but my cock ruled my head and I crept in . My sister in law still didn’t know I was there and Linroy just urged for me to take over from him . He slid out of her and I nervously slid my cock into Debbies wet pussy and started to fuck get which felt so good ! Linroy went around to her head and she suddenly realised it wasn't him fucking her . She looked around in shock to see it was me but before she could say anything Linroy stuck his cock in her mouth . She didn’t protest instead she sucked him as I fucked her hard . We changed positions as Debbie rolled on to her back ! She screamed she was cumming and I shot my load into her ! Linroy took over but as he was about to cum he pulled out and spunked all over her lovey big tits . She got up and licked some of his spunk of and with a big grin on her face said that was fun I’m off to the shower can you pour me a large G&T. Debbie emerged from the shower and sipped her drink ! Linroy and I didn’t utter a word as we didn’t know what to say but Debbie smiled and said let this be our little secret . I take it this plumbing job is going to take longer than expected ? Linroy and I still call around regularly just to check on Debbies plumbing !!! The end for now . .