Wife flashes old guy

My wife has recently become very keen on doing the garden but didn't really know much about it. She often visited the garden centre and picked up the free leaflets explaining how to do things. One day when she was looking, an old chap in his sixties started chatting and gave her some advice about planting out her flowerbeds. They ended up having coffee in the attached cafe, and she took his number so that she could ask him about any particular aspect in the garden. He also offered to visit and help her with odd jobs. She said that he was very keen as he lived on his own and enjoyed meeting people for the company.
It was also probably due to the fact that she is an attractive, curvy 36 year old, who likes to wear short skirts and lacy tops.
Anyway he duly arrived on the Saturday morning at about 9 o'clock and she answered the door and let him in. I had gone on the usual sports club run with the kids, and returned about 9:30. They were out in the garden and she was explaining what she wanted to achieve. She was bent over and he was having a good look as her skirt rode up her bum and showed her thong. I could see her pussy lips either side of the thong and I think he was more interested in that then what she was talking about. She is not shaven and her pubes were clearly visible.
She invited him into the house for a coffee, and introduced me. I was intriqued as to what would happen and excused myself and stood by the lounge door as they sat down and chatted over coffee. I could see them both through the crack in the door and she was not at all careful about not showing her pants.
They chatted for about half an hour and he left. I retired quickly to the garden and she came out to see what I was doing. I mentioned that he seemed to be interested in her more than the garden and she said that she had noticed him looking, and had suddenly felt very turned on knowing that the old guy was looking at her pants. She had deliberately let him see by opening her legs from time to time. She thought she could see a bulge in his trousers but was not sure.
He arrived at about the same time the following week to bring her some seedlings, and she answered the door wearing only her dressing gown. Another parent was doing the club run so I was still in bed when he arrived. She had said that she wanted to show him a little more as it had made her horny the previous week. She described to me what happened. He put down the tray of plants and stood in the kitchen as she made coffee. She asked him to get the milk from the fridge and he stood very close to her as she washed cups in the sink. Our kitchen is very narrow and he was very close and she let her dressing gown slip open slightly so that he could see her cleavage and the sides of her boobs. He picked up a tea towel to dry the cups and his hand touched her bum (accidentally?) She was not wearing anything underneath and she said it was obvious that he had a hard on. He reached past her and rubbed his hardon againgst her bum as he reached for the cups. She pushed back onto him slightly and he took a little longer than was necessary to help.
She said by this time she was absolutely soaking wet as she was enjoying flashing. When he put his hand on her bum she was quite shocked but didn't move. She turned to look at him and he opened her dressing gown and put one hand on her tits and the other between her legs. He obviously felt how wet she was. This was more than she was expecting and pushed his hands away and pulled her dressing gown together. He apologised profusely and she told him she wasn't upset and that she had given him the wrong message. She said that she had liked it but was a married woman and didn't expect it.
They sat and drank their coffee and she told him that she would still like him to visit which he agreed he would like.
Once he had left she came straight up the stairs and demanded sex and she was so horny. She could not believe how he had turned her on.
The following week he turned up and she again answered the door in her dressing gown. This time she was even more blatant about flashing, and apologised for the previous week, and that she had enjoyed his attention but was a bit surprised. If he wanted, he could have a look at her body. He readily agreed and she opened her gown for him to look. He stared for about a minute then reached out and touched her tits, gently squeezing her nipple. She didn't stop him and his hand went between her legs and he slipped a finger into her very wet pussy. He asked if it was ok to get his cock out and she said it was. He undid his trousers and pulled out a fairly decent sized, thick cock. She said it was bigger than mine with huge balls. He started to rub it and pushed it against her. With his finger inside her she had the urge to hold it and rubbed him hard until he shot his cum all over her pubes. As he came, so did she, and she rubbed in his cum into her pussy.
He left soon after and she came up the stairs and we had the best sex that we had ever had. He often comes on Saturday morning and has asked if he can fuck her, but she is not sure whether she wants to go that far.