OK, one way that this will work the easiest-but remember that is a relative term-taking two is not going to be easy at all.
Have one lay on his back, you ride him for a bit to open you up. Then have the other guy lay on his back and have him lay his legs over top of the legs of the first guy so they are balls to balls with the two dicks next to each other with undersides touching. This works best when both are similar in length and there is no wild curve to either one of them.
At this point, you need to load up on the poppers and take your own time in sliding down on the two pieces of meat. It hurts like hell in the beginning, but once you get more comfortable-things will be quite pleasurable-for you and your buddies as they will feel the tightness of your hole as well as their two rods rubbing together. The cum will be intense-almost guaranteed-for all three of you.
This is not something I recommend doing often as the sensations for you will be less when you do not have two rods in you-which we all know is more often than not.
Have fun.