Inflating my head
I remember doing this several months ago. Basically, I had not had a wank for a couple of weeks and was horny as hell - when I came to my wank I made a big thing of it and must’ve been going for some 30 minutes when I pushed my lower abs/kegeled and my head inflated. I was astonished by it and continued in short bursts - the result was a lot of precum and I nearly urinated. Now I can hold it for about 10 seconds in one burst after another. Anyone else do this and is it unusual?