Quite a lot has happened since my last update. We finally had our first real life cuckolding experience! First some context.
My wife started taking tango lessons at the gym downstairs for the past 2-3 months, she found a private instructor who teaches at a local art/dance university, he's young and pretty fit. They spend about two hours together every week, so that is a lot of one on one time, and since tango requires quite a bit of contact, they started becoming familiar fast. They planned to film a final version of their current routine so she can keep a copy of each performance. For the last practice session before filming, my wife thought she'd show up in her full outfit just to see what it looks like on camera, and also to see if she can get a reaction out of her instructor.
I wasn't there to see but according to her, he was more tense than usual, wasn't handsy during class but noticeably held her tighter to his body. She also caught his eyes darting down to her thighs and butt everytime her skirt flairs up.