I'll start with second from left, please. He looks like he might be the quiet type but I think I could get him yelling for more!
.........so they're checking out his story that he was "just bumming around". (Notice the guy on right has his own cock out, and it looks like soon it should be hard enough to use where his stick is probing.)
And they're sharing a friend who can't believe his suck-luck.
But all three look highly stimulating - and stimulated! My own first choice would be the one on right.
You can tell by the way he's holding onto those balls, which he won't let go until every last drop of cum has been seen right down his throat. This is the way to do it!
But I reckon there's life in every one of these, which I'd be only too happy to test.