There is a 12 year age gap between me and Lorna. About a year ago, after 8 years of marriage our sex life's had dwindled to almost nothing. She was 28 and complained that I couldn't get it up and hardly ever fucked her. I knew that there was no problem getting hard, I'd been fucking one of the secretaries at work for at least the previous year. The problem was with Lorna. When we'd married she been a curvaceous size 12, nice tits and arse but now she was at least a 16 and fat. They only way to get it up was to think of someone else when we fucked. We were in bed, she trying to get me stiff for a fuck, me hoping she didn't intend to get on top if she succeded, when she made some comment about me being an old, impotent, limp dick. My angry, unthinking response was "Only with you. Take a look in the mirror. You'll see why I'm not hard. I can't imagine anyone would want to fuck you". I apologised, I had hurt her feelings but she said nothing about my "only with you" comment. She was sorry for what she'd said and vowed to lose weight. Again, I thought. Actually, to my surprise she not only stuck to her diet, but took up swimming and going to the gym and the weight started to come off. I carried on fucking the secretary but that finished around April this year, about the same time she started coming home later from work and going out "with the girls". She looked attractive, we still hadn't had sex, she said she didn't fancy a shag. I work about a 45 minute train journey from home but due to essential engineering works was often being delayed. I'd been working late and Lorna rang to ask which train I'd be on, I told her the 9.10pm reminding her it'd probably be late as it usually crawled along one section of track through a cutting. She had travelled the route and knew where I meant. Being late June the days were long and it was bright and sunny, not long before sunset when she called my mobile at 9.15pm, checking I was on the train, which side I was sitting. A few minutes later, as we crawled through the cutting at walking pace, a text, "Look out the window". The train was fairly busy and I could see people further down the carriage standing looking out the window. I soon knew why. On the embankment just about level with the windows and only yards away was a woman being fucked. I knew immediately it was Lorna, wearing only a wide brimmed sun hat pulled down to obscure her face, fuck she looked horny. The man was on his back, she was on top, leaning back facing the train, her tits swaying as they fucked. She'd shaved her pussy and with her legs spread wide I and everyone else could see the blokes cock slamming into her cunt. I could see she was fingering her hole as well, lifting up and down his thrusting prick and as we drew level that he was holding her buttocks, spreading them and appeared to have a finger in her arse. Her mouth was open, probably shouting out, then straining to see once we'd passed her still writhing on his cock as they came. My prick was still hard when a few minutes later another text "At least someone wants to fuck me, see u at home". Thirty minutes later I got off the train, a 15 minute walk and home. I opened the door with some trepidation and feelings of arousal. Lorna, had had time to drive home, was in the lounge, not alone, 2 men all of them naked. She was kneeling, being fucked from behind, turning her head, slipping the cock she was sucking from her mouth she said "Sit down or fuck off". I sat, watching as she took his cock back in her mouth sucking him. Her tits swaying beneath her, nipples erect and surrounded by bite and teeth marks. She sucked and was fucked for several minutes before the lay her on the sofa and changed ends. With one of her legs on the floor he got between her legs, putting the other over his shoulder, spreading her wide, holding her cunt open with his fingers he rammed his cock back inside her. Her head was hanging down off the end of the sofa, the other bloke feeding his cock into her open mouth face fucking her. She took his whole length, swallowing his prick, deep throating him. Something I didn't even know she could do. Her cunt was soaked in juice as they both fucked her as they took her hard, fucking her, pinching and pulling her hard nipples until one exploded in her mouth, spunk shooting straight down her throat and the other spunked in her cunt. They pulled out of her body, dressed and left. Lorna looked at me with a look of satisfaction on her face as well as spunk running down it. "Is your cock hard?" she said. I nodded. "You're not going to fuck me but you can lick me out. Get down and suck the spunk from my cunt". I licked and sucked her clean, she even came again, then I asked if I could fuck her. "No not until I think you deserve it. Go and have a wank", she told me. That was in June and I have watched her being fucked 2 or 3 times each week since then and licked her out after but she hasn't let me fuck her yet. The thing is I'm enjoying it.