>>34686151This applies to cutfags only. If you're uncut, I can't help you, but good on your parents for not mutilating your genitals.
Use the deathgrip to your advantage. Grip at the base of the shaft and force the skin to move with your hand so that it crests the corona and extends up over the majority of the glans. Repeat until climax is achieved. Do this regularly as a primary portion of your normal masturbation routine.
The goal is to stretch the skin and improve its flexibility. With some practice, the skin should move much more readily with your hand, and it should feel like the glans and the internals of the shaft are gliding effortlessly inside the skin. You should notice that it takes progressively less effort to make the skin envelop the glans. The experience should become more pleasurable, as you are effectively emulating what it feels like to have foreskin. This will transfer over to actual sex, where your skin will continue to emulate foreskin (as long as you aren't throwing a hot dog down a hallway).
As an added bonus, this exercise should improve your hardness and ejaculation. The basic execution is similar to jelqing, so many of the same benefits can be derived.