Out of the Blue by Declan Rhodes

Childhood best friends, gay Parker and straight Cole have always shared a close summertime bond in their Great Lakes coastal town, Blue Harbor. When a newly confident Parker returns home from his first year in college more handsome than ever, simmering attractions spark into something neither expected.
Seeking relief from nosy observers, Cole suggests they set up a fake relationship. Parker agrees and secretly hopes the pretend dating can turn into real romance.
Just as their private passion threatens to turn them into genuine lovers, a candid video brands them #BlueHarborBoyfriends on social media. The video goes viral overnight.
As friends, neighbors, and total strangers celebrate their relationship with noisy support and messy questions, both Parker and Cole battle anxieties about their future. Can a single summer of self-discovery cement their transition from secret soulmates to official boyfriends?