Lord Monroe's Dark Tower (The Albright Sisters #2)
Elf Ahearn

When he was fourteen, Flavian made a mistake so devastating it ruined all hope for happiness. Years later, he’s still paying for his sin. But before his ward’s troubled mind destroys his home and family, he must see Claire once more. Vowing to keep their relationship professional—she the healer, he the guardian—he finds the bonds of his resolve snapping. Somehow, he must content himself with the love that could have been . . . but he cannot resist . . . one final embrace . . .