Barbarities III (manga)

Lord Montague is a powerful figure in the nation, in need of a bodyguard following a threat to his life. Enter Viscount Adam Canning: a dashing blond-haired nobleman who swears to use his combat skills to protect Lord Montague...and woo anyone who catches his fancy while staying at Lord Montague's estate. When Adam sees Lord Montague's nephew, Joel, Adam is immediately smitten.

But Joel is a serious young man, too busy rooting out crime and corruption to fall for Adam's charms. Of course, that just makes Adam want him more! Can Joel stay focused on his lofty ideals, or will he fall for the devilishly handsome viscount?