Instant Obsession by C.M. Steele

Addison would do anything for her bestie, and that includes hunting down the best man. He refuses to cooperate, so she takes matters into her own hands, but she might have just met her match.

Tanner isn’t your average guy. He’s hot, smart, and completely closed off. He has reasons he doesn’t want to be the best man, but things change the second the fiery redhead storms into his office ready to go to war.
She doesn’t know that once Tanner’s obsessed over something, the obsession doesn’t just disappear. He has to have it, control it, and never let go.