No conversation about condoms beforehand, let him think its assumed. Get the bottom really excited by rimming him against the wall, then start feeding poppers. Get him slick and wet, making sure to get a few fingers up there continuously. One last double feed of poppers for the bottom, then when he is buzzing and thinking he's still just getting rimmed/fingered, just part his cheeks and push your dick in and start fucking bare. By the time he comes down from his poppers high it will be too late, another quick hit of poppers, usually at this point any reservations disappear and they are excited to ride raw cock.
