These are books 3 and 4 of Hoyt's Legend of the Four Soldiers quartet, which is about four survivors of a British regiment ambushed by Indians in the not-yet-United-States. (I will get to this rant in a moment.)
To Beguile a Beast - Mrs. Helen Fitzwilliam has finally decided to leave her keeper, the Duke of Lister, but she knows he'll go after her just to get her and his two bastard children back. She ends up trying to persuade naturalist Sir Alistair Munroe to let her stay as his housekeeper, since he desperately needs one. Alistair is the titular beast, as he was scarred and had two fingers cut off during aforementioned ambush. Thankfully, this book has relatively little about the ambush, which meant I could pretend to ignore it so as to not throw the book against a wall. Most of the plot revolves around Helen escaping the Duke of Lister, and amazingly, her two children are not nauseatingly cute. In fact, I actually really liked the very solemn and not at all cute Abigail. I like that the hero is actually scarred, as opposed to the usual "Oh WOES I am UGLY wait no it's only a mild scratch" thing, but I was rather unconvinced by how long the "I am not worthy of your love" thing was dragged out on Alistair's part. Overall, not bad, though I like her Princes trilogy better.
To Desire a Devil -
( Spoilers and rantiness )