Vicki wants step dad

This story starts 15 years ago when I met a lovely woman called Rachel , who two years later would become my wife . Rachel had a *********** son billy and an ********** daughter , Vicki . We all lived together and got on well , life was good and I had never been happier , even to the point of never cheating on Rachel , something I had done in all my previous relationships . Our sex life was exciting , my wife has such a sexy body with great big tits . Moving on to the present day things were still good , billy has moved out , Vicki did move out for a couple of years but her fiancé ended their relationship a couple of months ago so she had to move back back home with us and that’s when my relationship with my step daughter changed ! Vic in all the time I have known her has never been without a boyfriend yes even at the age of eight she had to have someone , she craves attention all the time , so being back home without a partner and only women in her office I was the only man in her life at this time , we have always been quite close , when she was younger I would take her to London for the day , she called it our bonding days . About a month ago when we were on the sofa watching tv she would hold my hand or put her legs on me but lately she has started laying her head on my lap with her hand on my thigh and lightly rubbing it up and down my leg getting higher each time so I have made an excuse and go to make a cup of tea . Three nights ago we had our grand daughter over for dinner and as vic was laying out the table , she was wearing a large vest , leaning forward her tit fell right out in front of me , luckily my wife and grand daughter were in the kitchen . Vic just looked me in the eye , tit still hanging out the side of the vest and said “ sorry daddy “ she never calls me daddy . She then licked her finger , stroked her very nice puffy nipple and put it back just before her mum came in to eat . Over dinner Vic kept smiling at me and at one point putting her foot in my lap and rubbing my leg. After dinner my wife announced she would drive our grand daughter home and then get some food shopping , so she would be out for about an hour . When they left Vicki sat opposite me on the sofa and said “ did you enjoy looking at my tit earlier ? Shall I take my top off so you can get a proper look and as she said that she lifted her vest over her head exposing her tits to me . I told her to behave and put it back on , even though the sight of them had quite an impact on me as I felt my cock starting to stir . With that she put her right hand inside her track suit bottoms which caused a small moan to escape her lips , come suck on my tits as I finger myself , I need a man to touch me , mum will never know , just suck my tits , please ! If you want you can wank over them , but please come and touch me before I explode . I was enjoying watching her play with herself but she was my step daughter and it would be wrong on all levels to join in . Before I knew it I was standing over her , cock in one hand , squeezing her big puffy nipples with the other . Her face went bright red and she let out a scream followed by “cum on me daddy , cover your *********** with your hot juicy spunk , well that was it I came harder than I had for years and shot all over her tits . Once we got our breath back I made her swear to keep this our little secret “ only if we can do it again was her reply “ I will keep you informed if it happens again