He forgot that it has to be ribbed, and just the right size and shape. Keep pulling it in and out, with the right amount of lube. Eventually, you'll feel gentle waves over your prostate.
It is at this point that you mix fapping into this. You have no idea why you're doing this other than the fact that we told you to and it makes no sense and on top of that, it's pretty gay.
But it feels good.
THAT is CG.