Wife [49] had sex in the pool with her best friend

Over the weekend we went to a concert with a group of friends. House we got had a pool . We got there the night before so we stocked on liquor. 3 hrs into drinking and swimming i felt it. Had an empty stomach so I decided to go in for a bit. I could hear the other couple inside so it was my wife and her friend left out. I felt better so I decided to go back out . As I'm walking out I look through the windows and I see her with her ass up against him. I could see his hands over her tits. I was turned on. I coukd see it in her face. The look of pleasure as he fucked her. He kissed her neck. They had no worries of anyone walking out. She then turned began to kiss him . He sat on the step his cock out of tve water. She began to suck it. She was taking what look like 8 inches. Stroking it lickkng it. He must of wanted just to fuck cause he stood up picked her up had her legs wrapped around him while he was thrusting. She was in heaven kissing fucking . He came i can see his body shake and her expression told whole story I also cummed all over my hand. I went to clean up and walked out. They were sitting next to each other having drinks. I got in kissed her. The rest of weekend they disappeared from time to time