My mother in law ,Emma visits us more than usual now and if you have read my previous stories you will know why. I have to admit that I did try to end it becouse of the stress of fucking the mother in law behind my wife's back but without success. To be honest she is so hot and dirty she is exactly how I wish Louise, my wife, was. Louise in fairness is good in bed, i mean she has a good body and likes to ride on top but doesn't like oral sex and she usually cums after a few minutes but her mum, well she's another story. Last weekend she came to visit again this time taking Louise and the kids out shopping. After they came back Emma was going to take them swimming but told us she felt ill at the last minute and asked Emma to take them instead. I had been working on the car so went to have a shower. I asked Emma to wait for me to come out so I could go with them, I guess I was trying to avoid the inevitable but it didn't work. I was in the shower thinking about the last time I fucked Emma feeling guilty and horny at the same time so was tossing myself off to get rid of the hard on when the bathroom door opened. It was Emma, she was annoyed at me asking why I was trying to avoid being alone with her. She asked me if I though I could just fuck her twice and that was that, I started to explain when she walked out. I though I had better talk to her and got out of the shower to dry myself and get dressed. I was in the bedroom nearly dry when she came back in, took the towel and told me I had missed a bit, I started to talk to her but she told me to shut up. I stood there as she rubbed me down and then stopped, took my cock in her hand and started to give me a gentle wank. It was a bit surreal really, I'm stood in the bedroom naked, my mother in law fully clothed tossing me off. After a little while she was on her knees sucking my hard cock faster and faster until I warned her I was going to cum. She told me not to and started to undress, by the time she got to her underwear I was pulling them off her and within seconds she was on her back. Emma took my head and pushed me down to her pussy for me to lick her out. She knows exactly what she wants, she pulled my hair so I had to work my way up her body until she guided me to her nipples. She told me to suck them hard so I did as I was told and when she was ready she told me what to do next. Fuck me she ordered. I didn't need asking twice so my cock was in her in a flash. We fucked like animals, the neighbours must have heard the grunting and groans along with the banging of the head board on the wall. I realised last weekend how much her tits swing when I'm fucking her, both with me on top and with her on her knees with me fucking her doggy style. She loved that the best, pushing herself backwards so my thrusts are harder. I love feeling my balls swinging and hearing the slapping as she fuck. This time the cuming was nearly too much, we both came at the same time holding on so tightly I nearly passed out, her pussy tightens when she cums which squeezes my cock and I pumped I lifetimes cum into her but where a woman usually likes to stop and lay there Emma just wants to keep fucking until my cock is soft and slips out. We lay there for ages, Emma playing with me until I was at half mast again. We had worked up such a sweat we had to shower before anyone came home having one last fuck before Louise and the kids came home for tea. So now I have admitted defeat and agreed to meet her once a week ' to keep her happy' as she puts it.