Watching my wife getting a massage by a professional masseuse

My wife has for a long time visited a professional chiropractor and masseuse who, from time to time also fixed my back. He is a bulky guy in his 50s with big strong hands and a great sense of humour. On several occasions, I was allowed into his manipulation room to see how he fixed my wife's back. And that was a rather stimulating experience. First of all, to watch my beautiful wife in her mid-30s undressing in front of an older man. And though I realised that the doc deals with all sorts of female patients on a daily basis and must be accustomed to female semi- or even full nakedness (God knows what he demands of other female patients!), the pure fact that she bares her full slightly sagging tits without any embarrassment, that sometimes she wears almost transparent panties or, even worse, strings, which leave almost nothing to imagination, all those thoughts fed me with a strange feeling. Something between jealousy (sense of possession) and sub-conscious desire to exhibit her intimate places even more to another man.

As she laid belly down on the massage table, I tried to peek between her legs and also to figure out whether the chiropractor was seeing what I tried to see. But he talked all the time about some meaningless things and seemed to remain oblivious to my wife's plump buttocks and what was "hidden" between her thighs. Once on a massage visit, my wife, as she admitted to me "by a pure mistake", put on a transparent low cut panties that were, as I found out, only a string of flimsy material on the crotch. I was particularly agitated when I saw her in this garment. The chiropractor was trying to deal with her persistent lower back pain and for that purpose forced her to lay on her side. While she was taking that position she opened her legs right in front of my eyes. I saw her haired vagina lips separated by a thin strip of fabric. I felt instantly horny due to a single thought that the chiropractor would be able to see this picture as well. When she turned on her side the doc started to lift her leg slightly bending it towards her belly. Her crotch became not only fully exposed to me but, I am sure, also to the chiropractor. I noticed his eyes quickly exploring the view and then returning to their normal position. As long as the doc kept my wife in that position I explored the attractive view in every detail. Small hairs on protruding vagina lips, a little bulge of clitoris under the narrow white panty band and, finally, a tiny drop of vagina juice coming out from her hole. It was obvious that my wife realised that her crotch was visible and not only to me but also to the doc and she was getting sexually aroused.