Actually, sam.77, it was pretty fun for me.
There was a period of time, back in our thirties and early forties, when my wife's sister was very relaxed and comfortable around me. Sadly, she's gone all prude and modest in her fifties.
Anyhow, back then, I would see her regularly in various states of undress but with the important bits generally covered (except for breastfeeding).
But one day...I somehow ended up with my wife and her sister in a department store looking for clothes. So far so good. I was the "male opinion" and would get shown various items and give feedback. From there it progressed to me in the changing room with them, more efficient of course.
Then the main event. My wife's sister decided to try on some bras and I was not banished from the dressing room. I found myself standing in there with her as she nonchalantly took off her bra and tried on a new one. At one point my wife actually went to get her other models to try and left just the two of us and the show continued. It was pretty amazing to be in a small changing room, not three feet away from my topless sister in law, discussing the various models, giving my opinions, watching her change out of each one and try the next. An event which was never repeated but left an everlasting memory.
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