Wifes friend in the hot tub

Last new year we had a party at our house, drinks were flowing and we decided to get in the hot tub, my wife was very drunk and fell asleep on the sun lounger in the garden. Myself and my wifes best friend and her husband were in the hot tub, i know she has always like me and wanted my cock so whilst the bubbles were on i slipped my foot up to start playing with her pussy with my foot. Done this for a while and you could see she was very much turned on. She kindly asked her husband to pop up their house and get some more alcohol. Which he did, as soon as he was gone she pulled my cock out and started sucking it saying that she has wanted this for a very long time, after a while she stopped and i bend her over the side of the hot tub. Thrusting my cock into her very tight pussy. The water was splashing and making loads of noise so we got out on the hot tub and i fucked her in the sun lounger next to where my wife was sleeping. I have been fucking her once or twice a week ever since. If i dont she messages me asking for help with her business and i know that is she needs to be fucked. I think her husband suspects something that is going on as he looks at me weird when we have get togethers..