Fowfer temporary flaccid girth expansion

I was thinking of excercise to be doing when I get to my new job place, privacy problem make me thinking what to do, then something click in my head do fowfer. But I can’t unzip to stretch/BTC stretch, I try to just sit on my penis without stretching it. After 30 minute my penis girth expand and it stay for few hours before trying again

Is just 3days but my flaccid girth has gain although not permanent for now.

So is simple I just sit on my dick witout stretching it and sometime I add pressure by squeezing my dick using my tight