As a few people have done I have worn a plug out shopping.
The other weekend I put on a pair of rubber briefs with a built in cock sheath. I was already quite turned on just by wearing these. They provide a lot of cock stimulation too so was quite hard.
I then put in my inflatable and vibrating plug. I pumped it up a few times and set the vibrator on low. I then pulled on a normal pair of shorts over the top of this.
With some careful positioning I was able to keep the pump positioned next to my left pocket by kind of hanging it off the drawstring to the shorts inside. I put the vibrator controller into the waistband of the rubber briefs. I could still reach the vibe controls from the right hand pocket.
I then went out and did the weekly shop. This usually takes at least an hour.
I was really conscious as to whether people might hear the vibrator but by the end of the trip it was pretty much on full.
I was also worried at one point that I might lose the plug. My anal muscles was almost spasming from the stimulation. I had to give the bulb a few more pumps just to make sure it stayed in properly.
By the time I got home I was seriously horny so set myself up my self bondage chair and had a good session on that.