The Try Line by Rebecca Rathe

Jason Reinier fell in love with Mik Sanders the moment they met. After years of pining after his best friend, a single night of passion showed him Mik felt the same. Their future together seemed guaranteed until a painful truth tore them apart.
To escape the heartache of losing his best friend and lover at once, Jason accepted an offer overseas to play professional rugby. Mik remained, tethered to a life he neither expected nor wanted.
Eighteen years later, Jason has returned to face his former lover turned brother-in-law, while Mik plays the part of doting husband and father. The years of pain and resentment are no match for the heat both men still feel, and they enter into a forbidden affair—despite knowing from experience every decision has lasting consequences.