I was 32 at the time and my neighbour was 24. She had been married for three years and as I later found out, totally unsatisfied with her sex life. Her husband was a professional (Radiologist) and only had sex every six to eight weeks. This was something his beautiful young wife couldn't stand. Married, with two kids and living next door, I had no business fooling around, but Sandy was beautiful and she came on to me.
Sex became a frequent occurrence with her, as we'd find time to get together two or three times a week. Often at her parent's house, which was a mile away. Sandy was a very willing partner and would try anything and everything, but try as I did, she never had an orgasm.
One afternoon when we knew we had a few hours together, I introduced her to a vibrator. It was rather large and shaped like a penis with a rubber texture. Sandy had never seen one personally, so this was a new experience for her and yes, she was more then willing to try it.
Sandy lay back with her feet flat on the bed, legs spread and started rubbing the vibrator over her cunt. I think it took several minutes, but suddenly she started really getting into it. Her hips started rotating and gyrating, as if they had a mind of their own and her eyes closed. Moans started coming from her mouth and it was at this point I started massaging her right breast. Pinching her nipple and soon following with a finger in her vagina. Curling it up toward her abdomen in a come here motion, while stroking it in and out.
In a very short time, maybe two minutes or so, Sandy was gasping and moaning, while humping my finger. She was moving the vibrating cock over her clit, when suddenly her legs clamped shut, eyes opened and seemed to roll back. A guttural moan escaped her lips as she had her first orgasm ever.
She couldn't really move much for a few minutes and dropped the vibrator, shivering as if cold. Five minutes later I got a super hand job that I must admit took me over the edge far too quick.
After that first episode, that vibrator was often part of our lovemaking and while she never was able to cum by screwing alone, we'd manage to run it over her clit while going at it and she'd often cum long before I would.
We had this affair for about three years, but she and her husband finally divorced and she moved in with her sister in another state. Neither of us will ever forget each other and certainly not that first toy that got her there.