Would repeatedly masturbating using a smaller and smaller diameter tube cause damage over time reducing the amount of blood allowed to enter the corpora cavernosa thus reducing overall size?

Just wondering by if it possible to shrink my erect penis through chemical/physical means while still being able to obtain and erection for penetrative sex? I’m currently 4.75” but I would like to shrink it down smaller. I’m currently giving chastity a go but from what I’ve read shrinkage will ...