I'm a single guy in my mid fifties with four grown children.  The two oldest are not my blood, but most definitely are my kids.  They also consider me their Dad one hundred percent.  (I'm the ONLY Dad they've ever known.  Their real father is about as worthless as a human being can be).

 While they were growing up, my ex (who is not any sort of disciplinarian) could only see my attempts at discipline as abuse or a failure to love "her" children.  This naturally caused a great deal of tension in the house in general and especialyy between my stepdaughter, I'll call her Jewell, and me.  Maybe the conflict blinded me to what beautiful and sexy teen and young woman she was and became, but in any event I never had a lustful thought about her when she lived at home. 

When Jewell turned 18, she moved out and began living with her boyfriend at his parents home.  after a few months, our relationship improved improved greatly, and now seventeen years later, we are extremely close.  Jewell had her first child at twenty.  Shortly thereafter I started feeling differently about her.  I began to to realize how sexy she really is, and although these thoughts made me uncomfortable, they also turned me on to the point where I would begin to get hard driving home from a family function if she attended.  Over the years which included two more children, my feelings intensified.  Three years ago, Jewell and her husband went through a difficult period, and she and my grandchildren came to live with me for about eight months.  My feelings toward her went from strong to almost obsessive.  I was getting unexpected erections and jacking my cock at least a couple of times a day.  I hadn't been that horny since I was a teenager.  I still fantasize about her almost nightly, and these fantasies always result in rock hard erections and fantastic orgasms. 

 I would never let her know about my feelings or do anything to jeopardize the fantastic relationship we have now as parent and child.  Maybe writing this down is a good means of blowing off emotional steam and keeping my sanity, haha