centrum mate. You are going to DO this! Take delight already man! Look forward to that time when you're gonna leap that hurdle of post ejac blues and land in a whole new world of post-orgasmic erotic pleasure. Cuz that, for sure, is where you land.
Guys have mentioned various approaches and one or other of them might be right for you. Let me offer you another:
Solo. You know you have a lot of time. You're comfortable in a warm room where being naked and still a while is fine. You choose whatever stimulation - probably some well done porn that is gonna go on a lot longer than you do - stimulation that really gets a churn on you. The other mental preparation is that you know you are gonna tell the guys on this thread of yours that you did it and give us the detail.
So you're lying down, bit propped up, so that when you shoot your wonderful pearly stuff it's gonna spatter your chest and belly and dribble into your pubes, and you can see it yeah?
Now here's the thing: You don't have to rush this! Enjoy each stage of what is going on. Take huge delight in your ejaculation, and then take your time admiring the potent amazing life-giving rich-scented artistic rope-mess you have made of yourself, and smile about being alive and sexual and masculine and fit to spawn a nation.
Then, in that wonderful couple of minutes when the cum goes a little more gel-like in its unique consistency, play with it with your finger some. Do a little swirl on your abs. Then ...
Bring that finger up to your lips and do a little pretend fuck into your mouth with it, thinking of how you press your boner into pussy and deliver this excellent mix in there. Take the tang of the taste. Say to yourself, "Again. More". Feel the pleasure of being a male slut. In larger and larger doses, scoop up the lot and have it smear on your lips and dribble some on your chin like you like to see it on a gal who's pleasing you ....