My own experience of this was a couples holiday we took about 10 years ago. My wife's friend warns me ahead of time she spends every foreign holiday "basically topless the whole time". I've never looked forward to a holiday like this one
She wasn't lying either, 2 weeks of wearing nothing but a thong. She had an amazing figure and a fantastic pair of C-cup pert tits that I spent 2 weeks staring at. She caught my gaze on more than one occasion and just smiled. She asked me to put sun cream on her back at one point......I saw my wife watching me like a hawk as I did it