In Daddy’s Custody by Ava Sinclair

When ex-Army MP David Grant comes home to Bridgeport, he finds a lot of things have changed. For one thing, there’s more crime. For another, the annoying younger sister of his best friend has grown into a real beauty, even if she does hide it under hoodies and baggy jeans. However, David soon realizes that her looks aren’t all she’s seeking to hide. The woman he used to call “the brat” is keeping a secret, and he aims to find out what it is.
Lillian Schiff wants nothing more than to leave Westport and get away from the well-meaning but overbearing brother who has raised her since their parents’ death. But to make this happen, she’s gotten involved in a scheme that puts her on the wrong side of the law, and in the crosshairs of the man who has been her secret crush for years.
He once saw her as a brat, but now that Lillian is in trouble, David sees her as a someone who needs love, and firm guidance to put her back on the straight and narrow.