I've been remembering a woman called Claire I had an affair with in my mid 30s. We were a similar age, I was married and she had a long-term boyfriend at the time. She had blondish hair, usually held in a ponytail, stood about 5'6 high, and was a size 12 with smallish tits and pert little pink nipples. She had a very sexy arse that was a bit chubby but which usually attracted a backwards glance from any passing man. We met through work originally and after a few months of serious flirting we ended up having a drunken snog at a works party one night and that started an on-off affair that lasted three years. It was the perfect affair,  we both valued our relationship for what it was, we didn't judge each other and neither of us wanted to make the relationship any more formal. 

The sex was great and we were very open with each other. We'd talk about our fantasies together, about which ones we'd actually like happen and which were best left in the world of fantasy. We both had fantasies about involving others in the bedroom and she would often tell me that when she was fucking with her boyfriend, she would imagine I was there, watching as they pleasured each other. I admitted to her that if I was there, I would want to reach under and feel his cock going in and out as he fucked her and then suck him and taste her cunt on his hard cock. She loved this idea and used to get very wet when I told her about some of my experiences with other men. She'd make up stories where she directed me with a variety of men, taking me places I would never dare go in real life. We'd lie in bed, usually after having had sex once already and tell each other stories as the other would masturbate. She used to lie on her front with her hand between her legs and finger herself as I lay next to her, stroking her bum and whispering in her ear. One story that really used to get her going was the 'older man' fantasy. She used to love it when I put her in a situation where she was struggling against an older man, his hands pawing at her, her naked body being owned by him. She told me it was about the thrill of submitting to someone, giving herself up with no control or responsibility. 

There was one man in particular that she used to like me to focus on; he was an older man who owned the stables where she used to ride. Nothing had ever happened between them but she remembered he was a bit of a letch and always offered to help the girls down from the horse at the end of their ride. She used to get very worked up if I put her in a situation where she'd been left alone with him in the stables and he was going to have his way with her. I'd tell her to imagine him pushing her down over a hay bale, his hands tugging at her jodhpurs till they were down over her bum. I'd be lightly smacking her bottom as she lay next to me, wriggling on her hand between her legs. I'd tell her to imagine that it was his hand spanking her and that when her bottom was nice and red, he was going to pull her panties to one side and mount her, sticking his big thick cock right up her cunt. She'd feel his hands reaching round, pawing at her, groping her pert little tits and feel his bare cock throbbing in her cunt till he spunked inside her, his cum oozing from her swollen cunt lips. By this point in the story I'd be pushing my finger into her bottom, feeling her tight anus giving way and she'd squirm and pant, cumming when my finger was fully inside her, lifting her bum up and crying out as she orgasmed. I loved the way her tight bum cheeks clenched, her anus clinging tight on my finger, as she came. I was usually so hard by that point that I'd be rubbing my cock against her side till I spunked all over her.