A Traumatic Life Lesson on How to Flirt

Penny Wilson has never had a boyfriend let alone kissed a guy. It's always been an embarrassing fact about her. But the summer before her senior year, she decides that this is the year she will end her cursed single streak.
Six months previous, Penny's mom married her stepfather Mike Marsh who happens to have a daughter of the same age. Model status Brynn Marsh has never had any trouble getting boys to look her way. Having despised her new sister for her looks and opposite mannerisms, Penny has never made an effort to become friends with her new family.
Soon their parents decide that against their will, Penny and Brynn will attend summer camp. Already enraged at Brynn for snatching yet another guy Penny has had her eyes on, this is the final straw.
Despite her anger, Penny realizes that her mannerisms are what's keeping her from boys. Perhaps a couple lessons from her flirtatious stepsister could save her pathetic single life.