The title most famously refers to the 1980 coming-of-age film, though it is also a common trope in romance novels and fan fiction. 1. The Classic Coming-of-Age Story (1980 Film)
In this version, the "bodyguard" is not a professional agent, but a misunderstood high school student. My Bodyguard - Marton, Dana: Books - Amazon.com My Bodyguard