Maybe I need to read this again, but I'm having trouble working out how this is happening to you - do you have a super-small foreskin? OK, my sample size for observation isn't what statisticians would say qualified for a formal study of the matter, but it's greater than 1, and I have observed that it is normal for the glans to protude from the foreskin during erection, to a greater or lesser degree depending on the relative sizes of penis and foreskin - and then to spontaneously slide back over the glans after an erection subsides, with no need for any manual handling to make that happen. So I'm bamboozled here. Or is the deflation process not working for you?
@Bolletje - what am I missing?
It turns out I have a condition which also has a latin name where my foreskin is very tight. The "balloon" stuff is apparently something which can happen if you have the other condition and the foreskin slips back and restricts blood flow to the gland. I have erections fairly regularly despite being asexual (I think my libido is standard), and the foreskin slipping back thing has only happened to me thrice, with the story being the last time. In every instance it took a long time to get it back in place, 2/3 times with the help of a shower. The issue isn't with deflating, the foreskin is simply tight and settled into a groove right outside the glans, and it can be difficult to get a hold of the "edges" of the foreskin when it's in a skin fold and it hurts to touch even the underside of the glans to get a hold of it. I had to awkwardly get an erection to reveal the "edge, then try to get a hold of it and keep it as my erection receded. The doctors were able to fix me up while it was quite soft.
I knew circumcised people eventually got desensitized, but genuinely had no clue that the foreskin recedes back every singly time for most men (can you tell I have never watched porn?). That sounds exhausting and more than a little annoying. I see no negatives from having foreskin which always stays on.