My wife's sister had always turned me on. My wife and I have been together for 15 years. The first time I met her sister I had visions of fucking her. Over the years we have all vacationed together, hung out and done what normal families do. I have been able to catch glimpses of her tits and fine ass on occasion. We have always flirted and made sexual comments back and forth. Last week I was coming back from a business meeting and took a short cut through the country by her house. I noticed she was home and stopped for a cup of coffee. Her husband was at work and their kids are all at a local college. I walked in and she Was just about to begin her work-out. She was wearing a pair of tight spandex pants that accentuated her ass and pussy. Her nipples were sticking straight out in her sports bra. I commented that she could continue to work out while i watched, to which she said I could join her if I liked. I sarcastically said that i preferred to exercise nude. At that she said, " ok let's do it". She started to remove her top and her firm 34b tits sprang out, j about came in my shorts right there....she then started to slowly remove her spandex. With her back t ok me she slid the pants down below her perfect ass first ....I walked up behind her and began caressing her ass while I kissed the back of her neck. I then slowly ran my hands around to the front and slid my hands down to her pussy....it was shaved smooth and I could feel the warmth. I helped her out of the spandex and led her to the couch. She sat facing me while I slowly kissed her and played with her tits. I began to rub her clit and finger her while kissing her neck and sucking on her nipples. She smelled intoxicating. She began to moan as I liked my may down her stomach to her hot pussy. She came almost immediately as my tongue went to work I kept going enjoying all I could get and swallow of her juices. She then pulled my face up to hers and asked me to fuck her now. I pulled my pants down and buried my throbbing cocktail in her as she came again. I slowly banged her hard as my balls slapped her ass. I lasted about 5 minutes before I unloaded in her hot pussy. She screamed as we we came together. She then guided my sloppy cocktail into her ass and she slip toward me to make it go in faster. I pounded her ass for several minutes until we both came again..... we hurriedly got dressed and made small talk. I asked her if she was ok and apologized for getting caught up in the moment. She said she had wanted to do me for years and the time was finally right. She also said that the first time her pussy had been licked in 20 years. We now fuck at least once a week , sometimes even when our respective spouses are within ear shot...mi eat her every chance I get and live to tap her ass.