Where do I begin? Well I have been married to my wife for 11 years. She has two younger sisters. They've both stayed with us for extended times throughout our marriage. The youngest sister is like my daughter/sister. The middle sister is the one that I WANT! We've bumped heads most of our relationship but over the last year or so we've become pretty close. We have always had a unspoken attraction for each other. She wears skimpy stuff over to the house whenever she comes to visit. She has the most perfect set of tits and nicely shaped ass, not huge but definitely big enough to jiggle. Anyways, I've been trying to be a little bit more handsy whenever I get a chance to be alone with her or get hugs. Today, she came in my room while I was playing the game (headset was on) and of course I couldn't hear so she just leaned in for a hug. I'm sitting on my bed so her hips are about shoulder height. I reach around her hips and squeeze (per the usual) and purposely allow my hands to slide down her ass (which is absolutely amazingly soft, like a bean bag soft). She smiles and tells me she'll be back later.

Now, I haven't tried anything else with her. She's very outgoing and outspoken with me about her sex life or just life in general. I want to test the waters but not sure how to do so without this shit backfiring and fucking up everything.