Teacher Man by Grant C. Holland

Could it really be Seth Ferris, his high school crush? The last time Nick saw him was a decade ago during their college years, and Seth was on his knees. Now Seth was back, almost like magic, more handsome than before, with a nine-year-old son at his side.
Fleeing mistaken assumptions of his guilt for a disaster at the school where he was a teacher in Pilot Hill, Nick Katopidis returns home to the small town of Kettle Run to start his adult life over again. Keeping one foot outside the door, in case he needs to run again, Nick lives a quiet, mostly anonymous life, serving as a substitute teacher and surviving on interest from a life insurance nest egg left behind by his late parents.
Seth Ferris is back in his hometown of Kettle Run again after trying to forge a life elsewhere, too. Burn out from an inner-city teaching position and the breakdown of his ex-wife bring Seth back home to raise his son, Charlie. He’s hoping to build a stable life with a new circle of friends when he stumbles upon Nick at the local mom-and-pop fast-food hangout.
The chemistry between Seth and Nick fans smoldering embers into a flame quickly, and they share the memory of one brief erotic moment together during their college years. Unfortunately, time has a way of introducing more complications into life including whispered rumors about Nick, the return of Seth’s ex-wife, and Charlie’s temper eruptions at school, but deep down both Nick and Seth suspect they were meant to be together.