You should learn how to give yourself a mental orgasm (usually dry…unless you are especially gifted!). Imagine having your orgasm, then contract and thrust your thigh, ass, groin, and lower abs like you do when you orgasm, and breathe heavily; groan, even. I can do this without touching my penis, on the bus (quietly!), and even running/walking. It’s actually great exercise! You can fantasize or not.
Now add this mental focus to your jelquing/stretching routine. If I have time, I even masturbate to a or several edging/dry orgasms. Dry/semi-dry (small accidental cum-drops...which I lick) actually increase your energy and MAN-MOJO. Your thighs and lower muscles will feel invigorated, and your cock-meat will be engorged and throbbing for several minutes afterward. Great blood and energy flow technique—yes, it’s Tantric!