Wife's Doctor

I recently took my wife to the doctor to get a checkup. We found out that she had swollen lymph nodes around her underarm area but it was just because she had an infection, so nothing to really stress about.
Anyway, we've only been going to this doctor for about a year now. He is our family doctor and he treats my wife, our two sons and I. He's quite young, maybe early thirties but he seems very knowledgeable and we all like him.
So this is the weird part. When we entered his office that day for a check up, my wife explained everything to him and then it was time for him to do a check up. He got up and called us to his exam room which is just behind a curtain which was partitioning the same room into two different areas. When we got there he did her vital checks and then asked her to remove her top. She did, and he started examining and feeling the area. After a while he asked her if she would be comfortable removing her bra to do a full check as he said sometimes the nodes extend into the chest. She agreed and then she took off her bra. He started feeling her upper chest and slowly worked his way down to directly touching her boobs. He was not wearing gloves as he stated it's become accepted practice to avoid gloves during breast exams as it helps to detect lumps and things better. As he was touching her boobs I got an instant erection. It was like watching some type of fetish porn, I can't explain the feeling. After a while, he started to gently squeeze her nipples one at a time to check for discharge. As he touched her nipples, they got hard and I think she got really embarrassed. It's a very noticeable difference because her nipples are quite small and flat when she's not aroused but when she gets turned on, they quite literally triple in size which they did, right in between his fingers. She apologized to him and said that she didn't know why that happened. He was also a bit nervous by the looks of it when that happened but he said it's normal and nothing to be concerned about. I honestly think he didn't want to leave her nipples because he took mighty long trying to squeeze something out of them. It was the most amazing feeling after such a long time. I actually leaked a bit of cum while he was checking her nipples because it was so arousing. I'm so lucky I had charcoal gray jeans on. I had been with her to see other male doctors before who have seen her boobs but nothing was like this. Her nipples never got erect in front of other doctors before but I guess it was because this guy was young and attractive. After he completed the check up, they spoke for around 10 minutes while she sat completely topless and her nipples still erect. I caught him looking at the boobs a couple of times in between talking. She would never normally sit topless but I think it was really a different experience for her.
I cannot wait for her to make another appointment with him for a similar issue. I hope we need to come back. I haven't stopped thinking about him touching her and her getting hard. It's one of the best things I've seen. Probably would be best for me and our sons to find another doctor to avoid any awkwardness lol. I don't think they would enjoy speaking to him again if they knew what happened that day.