Touched by doctor

I took my 28 yrs old very attractive wife to doctor for some treatment he prescribed injection and took her to give injection he put curtain but there was gap from where I could see my wife laying in bed he asked her to turn around and took off her lower she did I can see him sexually aroused he put his hand over his pent to control his errect pvt part he than pulled down her panty quite low and put his hand on hips of my wife again tried to control his errected pvt part by putting hand on his pent & took unusually long time when they came out I can see wet spot on his pent
At that time I was very angry with the doc
But when we did sex next time I was thinking that episode and got more aroused thinking wife being touched by that man