Hmm, let's see:
Public changing rooms are always fun:
pack all your toys (dildo, plug, vibrstor and nippel clamps)
You do not war a bra for this at all.
You will go Into the first changing room and remove your panties and shove them inside your pussy, plugging your ass with your buttplug and edge once.
Get out and spend at least 10minutes before going to the changing room again, preferably switch shop each time.
Next stop, pull the panties out, shove the dildo inside instead, edge twice and put your panties on again.
10+min wait before next changing room.
3rd time, just add nippel clamps edge 3 times and get to the next changing room, dont keep the clamps on for more than 15min.
4th changing room, of with the clamps, edge 4 times with your vibrator, remove the dildo and keep the vibrator inserted instead on a low to medium setting.
Get out again and go to the 5th and final changing room.
Try not to cum on the way, once inside the 5th room, fuck yourself and cum all you want, release all that pent up frustration.
Once done, only leave the buttplug inside, clean yourself with your panties, gag yourself with your panties, cover it with your face mask and get back home.
You talked about picture proof, well I would be happy to find one or more from each room in my DMs.
Cheers.