The Brothers Dim by Kris Klein
Mark, at thirty-three, is over the whole finding-sex-online thing-until he comes up with a posting that turns into the ultimate lure for finding straight men that can be talked into some gay sex. An ad on Craigslist nets him a slew of replies, particularly in two prospective young bunkmates, Kyle and Chuck-who, at twenty-one and nineteen respectively, have a lot more in common than Mark could ever realize. Planning them for back-to-back head sessions (Mark shares with NO ONE), when Kyle arrives late and Chuck shows up only minutes later, Mark concocts a last-minute scheme to try and work a sizzling threesome with the two straight guys-with himself as the star-and his sexual appetite is only made more ravenous when he learns that, quite by accident, he's now standing in his bedroom with a pair of brothers. The only question now is, just how far can he get these boys to go…not only with another guy, as advertised…
But good God, maybe even with each other?