These Paths We Tread (Autobot x OC)

Catherine Wolf has been friends with Sam Witwicky for as long as she can remember, and been in love with him for the past two years. Unfortunately, Sam has been in love with Mikeala Banes for even longer. To make matters worse, an alien race of transforming robots made of two factions-- Autobots and Decepticons-- from the planet Cybertron come to Earth searching for a powerful artifact they call the Allspark. By some strange working of fate, Catherine is pulled into a war not of her making, and finds she has a much greater role to play than she realized. A friendship will be tested, unlikely love will be found, war will be raged, and a young woman will find her place in the world.

And to think it all started with a pair of glasses...

(Autobot x OC 'cause y'all are fun when you keep guessing xD)