My basic instinct was to run like hell. But like a switch had been pushed, there was a sudden bulge in my best flannel trousers."Mmm," was all I could...manage, as her full red lips moved close, and I tried desperately to catch my breath. The lips brushed across mine, briefly, gently. Was that it? Then her hand was on the back of my neck and her mouth covered mine just as I opened it to clutch in some air.Next second her tongue was lapping over mine. Briefly shocked I was then filled with wonder. Catherine began to move her sweet arse into my lap, moving back and forth as if she would do when she masturbated when lying on her tummy. My cock was straining at my fly, I was desparate to release it and rub it all over my sisters pussy again. I released my carresingleft hand off her breast and moved to my zipper,I fumbled with it for a few moments, struggling to undo it then finally opening it, reaching inside my underwear, pulling my cock free.I lifted her skirt up over her sweet firm arse,. I was honored that she would mention such things to me. She began,“ It’s not so great having a life of straight missionary sex; no touching or foreplay, a few maybe up to thirty seconds of animal lust and Jim would pull his skinny little prick out of me and roll off me and go to sleep. Many times throughout my marriage I would slip my hands down between my legs after Jim went to sleep. I’d manipulate myself to get a little pleasure out of it.” After hearing this, my horny mind got to wandering. He's still in his work clothes. Some sort of hi-Vis fleece over a cheaplooking logo-ed polo and sturdy work pants. Standard factory foremanwear I surmise. He may well have showered this morning before work; Ileft before him; but as I unzip his fleece I detect the aroma of a dayslabor.He smells of man I suppose. A day of sweat and toil. It's unappealing. Idread to think that one day soon I may feel the opposite about it. I'drather the scent of my own perfume lingered in my nostrils. God knowsI'd.