Cole is book 3 in the Laurel Falls Possessive Mountain Man Series by Cindy Smoke.
Maggie is the sister, and Cole is the best friend of Bash from book 2, and the books overlap a bit.
Maggie has had a crush on Cole for years. The problem is he's only seen her as Cole's little sister. When he sees her, he can't help the attraction he feels for her. She is as in love with him as she always has been.as the two have to work out the distance between them they find they no longer want to be apart.
As with the other books in this series, this is a cute, quick steamy read.