Silent Knight by Arden Steele

Being part siren isn’t exactly a secret, but it’s not something Simon Russel likes to advertise, either. He’s not ashamed of who he is or anything so dramatic as that. But people tend to treat him differently once they realize he can manipulate their emotions. Just once, he wishes someone could see him and not the demon within.
Enter Archer Knight, a former Enforcer and the newest guard at Blackhaven Manor.
Forced into retirement after a poorly executed mission leaves him damaged and disfigured, Archer figures he has a right to be a little bitter. With his scarred face and surly attitude, he’s not going to win any popularity contests, which suits him just fine, or so he tells himself.
Until he meets Simon.
Mix one not-so-chance encounter, a heap of holiday cheer, and a dash of misguided but well-meaning intentions in this recipe for Christmas magic. Season with love and serve with a side of awkward family get-togethers.
Don’t forget the marshmallows.