Balls to the Walls is David's motto, along with the name of his one-man personal training firm. Callum, young and enthusiastic, wants to be a better footballer, and he hires David to train him.

Usually shy, Callum can't help himself when he exits the locker room's shower and sees David standing before the mirror, a snow-white towel wrapped around his lean waist. He has not yet showered, and he smells of musk and man.

David becomes Callum's teacher in all things physical, but things really heat up when Callum teaches the older man a thing or two about emotion and vulnerability.