The Comeback Kiss — Lani Diane Rich

ALL IT TAKES IS ONE LITTLE KISS...
In order to keep custody of her teenage sister, Tessa Scuderi told a small (okay, big) lie to the people of Lucy's Lake, Vermont, about what really happened ten years ago when Dermot Finnegan took off with her virginity, her car, and the town bell. It had been working, too, until she found her old car parked in front of her house, keys in the ignition, and a telltale red hair stuck to the headrest.

TO TOTALLY SCREW EVERYTHING UP.
All Finn wanted to do was return the stupid car and get going. But he stopped to save a burning pet shop (big mistake), ended up kissing Tessa behind the drugstore (big mistake, but worth it), and discovered that Tessa's been building him up as some kind of town hero all these years (gonna have to puzzle that out). Now Finn has to find out who's behind a string of mysterious fires and deal with the heat between him and Tessa. Hey, one more kiss can't hurt-or can it?