I walked to our local pub for a quiet pint as my wife was working the late shift as Maitre d' at a city centre hotel. I collected my beer and looked for somewhere to sit. Sitting a table I saw my sister in law Jill. I went over and said hallo. She invited me to join her. She had been due to meet two girlfriends from the school where they all taught but they had cried off at the last minute. As she was already here when they called she decided to have a couple of drinks before leaving for home. We sat drinking and chatting when I felt a hand on my thigh, gently stroking towards my cock. I looked at Jill and she smiled and asked me if I liked it. I reached down and moved her hand onto the growing bulge in my jeans. I thought it might call her bluff. But no she merely grasped my bulge and squeezed. I said if she carried on like that I was going to come and I usually did that noisily. She said alright get a bottle and come round to my place and then I could be as noisy as I liked. I had fancied screwing her since she was sixteen when I first started going out with Mary.I bought a bottle of white wine and we set off. Crossing the local park she stopped and kissed me, her tongue probing deeply and her groin rubbing against my cock. I broke away and told her to stop it or I'd have to take her there and then. She looked at me and asked me why I couldn't. I looked a round and the park was deserted and quite dark. We wandered over to shubbery and worked our way into it. It affforded us a degree of privacy. We laid our coats and the floor and lay side by side. Jill undid her blouse and slipped off her skirt, she lay there in her silky half cup bra and matching shorts. I pulled her toward me and snuggled in to her cleavage. She smelled wonderful.I unclipped her bra and pulled it away releasing her beautiful round breasts with hard brownish nipples.My mouth was soon locked on one and Jill was groaning softly as I sucked and nibbled. Her hand slid down my chest and undid my belt, she released my zip and pulled out my cock. She began to stroke it, gently at first then rapidly.... I rolled onto my back and soon shot my load in the air. She said that was good as when I fucked her I was going to last a while. She rolled onto her back and slipped off her knickers, I pulled off my jeans and pants and positioned myself between her now spread legs. I could see her juices glistening on her shaven lips in what light there was. I rubbed my cock up and down her slit for a while and had her reach a couple of short spasms. Sensing we were both ready I pushed my bell into her entry and she took in a sharp breath. I pushed into her canal very slowly, her breathing getting faster the deeper I went. I felt the head of my cook arrive deep inside her as it pushed against her cervix. She groaned loudly and screamed at me to fuck her hard. Needing no second request I pounded her hard for five minutes before we both uncontrolable orgasms. She shook and shook and I shot string after string of hot jiz deep into her. She collapsed gasping for breath and I fell to her side gasping for mine as well. When she had regained her composure she got up and dressed I watched and felt my cock rising again.I dressed hurriedly and said that we should get to her place, drink the wine and screw again in the comfort of her bed. We did for another three hours, when I left in order to be home before Mary. Jill rang me at the office the next day and suggested we could do similar things whenever Mary was working the late shift.