Burn (Hammer #10)
Sean Michael

Things don't all go smoothly for the two men, though. Dave is into BDSM, he’s a member of The Hammer Club, and he thinks he could use BDSM to help Marshall relieve the stress and guilt the man carries, the need to always be the perfect hero. Marshall thinks that kind of thing is sick, though, and when he enjoys the stuff Dave does to him, he's convinced there must be something wrong with him and feels he has to break things off with Dave, even though he's more than a little in love.
Can Dave figure out how to convince Marshall that kink is not only not sick, but a way to keep sane as well, or is their relationship doomed?