Pumping gains from pulling out inner penis?

As the title states…

When you gain from pumping, is it actual lengthening of the visible shaft or is it just pulling out the inner penis? From what I’ve seen for myself, my gains seems to be coming from my inner penis being pulled. Is this even possible or are my gains happening because it is actually lengthening at the base? I’ve tried searching for Inner Penis gains but don’t really know what kind of keywords to use.

Any thoughts on this would be great. Thanks