Ordinary???

My Bf and I tried a vibrating plug for the first time in public about a week ago. It was very arousing at the time and the sex afterwards was amazing. BUT. When we walked out it felt like the plug was moving/about to fall out? Has anyone else experienced this? Is this something I need to get used to if we ever do this again? Once we got to the nearest bathroom I checked it out and it was fine but I’m really paranoid. The plug is about the same size as the medium that comes in the training kit, 33mm wide and 95mm long. We are slowly incorporating anal into our sex and D/s lives and this was a first for me but he has some experience with previous partners. Any advice or tips are greatly appreciated, TIA!

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