The Edge of Summer by Bobbi Maclaren

Delilah Delacroix is doing the best she can. Eight months after losing her parents and taking guardianship of her younger siblings, moving halfway across the country to a small island town is just what they need. Too bad this only seems to make her brother hate her more.
Fire Chief Luke Bowman can count on one hand the number of people he trusts. After what happened with his ex, he certainly isn’t going to let another woman get inside his head. But when Delilah comes to town, this proves to be difficult.
As summer burns and things between Delilah and Luke start to heat up, trouble lingers. Delilah’s brother seems to be drifting further away and she doesn’t know how to get him back. Meanwhile, Luke is trying desperately to keep history from repeating itself.
When a casual arrangement starts feeling like a whole lot more, Delilah knows she needs to walk away, but it’s easier said than done when Luke has seen all her jagged edges. Luke knows that he can’t give Delilah what she needs and letting her go is the right thing to do. So why does it feel so wrong?