Last week Wednesday get a call from the wife that is a trainee doctor (Stephanie, 25 very sexy traditional English pale skinned girl)in her last year that she has been asked to cover a night shift at our local hospital... No problem so I arrive home after a fairly hectic day thinking excellent, nice early quiet night just chilling out. Well at about 9:15pm the doorbell goes, I think to myself 'who the hell?' Anyway my Mother-In-Law, Jackie 52 year old fairly prim and proper size 16, large pair of 38E breasts not a stunner or anything, but defnitely something sexy about her... at the door. Looked like she had been crying, invited her in and she asked for Steph as she had just had an almighty row with the Father-In-Law and needed to just blow off some steam. Anyway I offered her a drink and an ear to listen to her issues... she straight away said that she would like something 'stiff' which was really not like her, but anyway poured her a vodka and tonic and I opened myself a bottle of red wine. After an hour or so and a bottle of red and her having a couple more vodkas I was finding myself looking at her in a completely different light. My wife and I have been married just over 2 years and I have always gotten on really well with the in-laws. However, I was sitting next to her in a pair of sweat pants and a t-shirt and I had no undies on and I could feel my cock twitching as I was listening to her speak about what and arsehole FIL was being the last few weeks. It was turning me on something serious as I obviously knew that she would have had no sex in this time either. She had a massive pair of tits and although she is a size 16 she had a great bum and really nice curves... she was wearing a white buttoned shirt and a black lose fitting soft material ankle length skirt, now although it was not revealing or anything I could make out that she had a pink lace bra on. I opened another bottle of wine for us to share and found myself zoned in on tits and just kept staring... and it seemed she did not mind all that much. We were both sat on a 3 seater sofa and she must have noticed my cock twitching through my sweat pants because she moved in such a way that she revealed most of her leg facing me through the slit in her skirt. Now I did never think that Jackie, my Mother-In-Law was the type to come on to her Son-In-Law. But she said to me that its the most angry she has been in a very long time with her husband and that she was feeling very tense about it all. I without thinking too much and with a bit of wine pursuasion asked if she would like me to massage her shoulders, as this is what I would do for my wife if she was a bit tense I told her. So without saying a word she put her glass down and turn so that her back was facing me on the sofa, I started rubbing her shoulders through her shirt occasionaly moving the collar of her shirt and mving my hands up and down her neck up into the lower part of her hairline and temples. She was sighing and moaning quietly with pleasure. I was absolutely rock hard in my pants by this time. We were sat awkwardly now on the sofa so I asked her to move ontop the footstool so that I could stand behind her. As we stood up to move she said it felt amazing and she noticed my bulge, my cock head was popping up through the top of my sweatpants but was still covered by mt t-shirt. She said with a smile on her face 'I hope you don't mind doing this for your old Mother-In -Law' to which I replied 'Its a pleasure!' I was now behind her and was struggling to rub her shoulders through her shirt so I gave it a few minutes and moved my hands around her front and undid one of her buttons to allow the shirt to open slightly to do a better job, she did not seem to flinch and I was not sure if it was the booze or not... she then leaned back against me and my cock was so hard just between her shoulders she just rocked from side to side for a second before I undid 2 more of her buttons which allowed her shirt to come off her shoulders completely. She then seemed to pull away but did not stop me - so there I am massaging my Mother-In-Law and she is just sitting in her bra. OMG my cock was at exploding point. She again leaned back all the time I am rubbing her shoulders, front of shoulders just above her big tits and neck and she just seems to be loving it. I then take the biggest risk ever and move my hands all the way down her front to cup her massive tits while pushing my hard cock right into her back. With this she turns around and says 'you are one very bad Son-In-Law' my heart sinks but she grabs my solid cock without saying anymore and pulls my sweat pants down to reveal my hard-on... It was like heaven, she was staring right at my cock and licked the head a couple of times before taking all 8" of it in her mouth, she pushed me into the back of the sofa and carried on sucking my cock (her 28 year old Son-In-Law) like her life depended on it. I was very close to cumming after a few minutes and moved her off my cock and dropped onto my knees in front of her and started kissing her passionatly, undoing all her buttons to remove her shirt and also taking off her bra to release her huge sagging 38E's with dark brown nipples that were like bullets and nice big areola. I did not bother taking her skirt off but just pulled it up to reveal a pair of white cotton school girl type knickers with the darkest pussy hairs protruding either side. She did nothing to maintain it. I was rubbing her pussy through her panties which were very quickly getting soaked through. I then lifted her onto the sofa and with ease pulled her panties down only to see the hairiest pussy ever imaginable. IT WAS GORGEOUS! I put my head down there only to see this gorgeous white creamy build up which smelt amazing... she was so wet! I went to town on her licking and sucking on her small yet very well matured clitoris and long pussy lips. She was holding the back of my head until she was shuddering and moaning as she climaxed in my mouth. I stood up and lay her on the rug and held my cock and looked her straight in the eyes as I positioned my cock between her very meaty pussy flaps ready to enter her now swollen very moist puss. We went very slowly in the missionary position for no longer than 5 minutes before I could feel my toes curl with the build up of the biggest orgasm I have ever had.... she grabbed both my arse cheeks and pulled me as deep as possible in towards her as I cummed right in my Mother-In-Laws pussy, filling her up like never before. We spent the night in my marital bed endlessly shagging and discussing how we can carry on our amazing new found fun, and she left early in the morning to the spare room before my wife returned. It will turn into a whole lot more... I hope it was not just a drunken one nighter!!!