A childish crush doesn’t guarantee either loyalty or happiness. And what if that feeling is real—and for a lifetime? Avery McTavish jokingly calls Owen Montgomery her first love because she was head over heels in love with him when she was six. Back then, she immediately declared that they would get married, and Owen willingly gave his “fiancée” a plastic ring from a vending machine for chewing gum. Many years have passed since then, and Owen is utterly astonished to learn that his best friend—Avery—has been carefully keeping his gift…