Seduction of a wife

Were living in England and had made good friends with a couple about the same age with kids about the same age. He was a very tall guy with huge hands (his fingers were bigger than my cock) and as I learned when we bumped into each other at the men's room, an enormous cock (think tripod).
After we had known them about a year he decided to have a vasectomy, and afterwards his wife was always telling my wife what a difference it made to their sex life.
One summer while his wife was away visiting relatives, he invited my wife over on a pretext (his car was in the shop and the kids needed to be taken to school). I learned this from his wife later (that's another story).
Of course when my wife arrived the kids were gone and it was just him in a robe-with nothing on underneath it. So as he was chatting with my wife in the kitchen, she was getting tantalizing glimpses of his dangling and swinging cock each time he moved.
They than sat down opposite each other and as his robe opened slightly she got a full view of his enormous appendage. He was quite experienced in innocent housewife seduction, so the whole time he talked to her he was staring directly into her eyes, whereas she could not keep her eyes of his cock.
She was wearing a nice skirt and blouse, and was crossing and uncrossing her legs unconsciously, which of course didn't help to calm her fevered pussy.
Eventually they went into the sitting room and he sat next to her. His robe was now unashamedly open with his cock in full view, and starting to noticeably lengthen and twitch slightly. As he chatted he was touching her arm and her knee occasionally,accidentally of course. He reached across supposedly to get something off the side table and as his face got near to hers their lips brushed. That was all the encouragement he needed. He started to kiss her gently and placed his hand on her knee, but she firmly kept her knees together. AS he was kissing her he gently brought her hand onto his cock, and started to part her legs. she resisted until he started to whisper in her ear about how nice it would be to feel fresh, warm sperm inside her pussy (he knew we used condoms). She goes wild when someone whispers in her ears, and the combination of his enticing words, her hand on his ever stiffening cock and his hand on her knee, she relaxed and her legs fell open.
As soon as her legs were open his hand quickly went to the top of her legs and he got his fingers inside her panties, and then inside her dripping pussy. By this time she was pulling has hand to get his fingers deeper into her pussy.
She moved over towards him and she straddled his legs with nothing but her panties between his cock and her pussy. He continued kissing her and slowly unbuttoned her blouse and unhooked her bra so he could suck her nipples and massage her breasts.
She could feel his cock rubbing against her slit through her panties, she was moaning and begging him to fuck her. As an experienced seducer he wouldn't insert his cock, so she raised herself, pulled aside her panties and placed the head of his engorged cock at the entrance to her pussy. She very slowly lowered herself and impaled herself on the largest cock she had ever encountered. He just sat there as she raised and lowered and raised herself faster and faster and was becoming incoherent shouting every pornographic exhortation that came into her mind.
When he couldn't hold on any longer, he gave one deep thus upwards, she screamed and felt his hot juices pumping into her pussy.She was breathless and sweating, and as she stood up the cum started to flow from her pussy down her legs. She was in turmoil, and buttoning up her blouse ran out the house saying she never wanted to see him again.
But she was wrong...