The Boy Next Door by G.A. Hauser

You'll never forget your first... Brandon Townsend and Zachary Sherman were best friends and next-door neighbors. Growing up together in a cozy suburban town in New Jersey, they were inseparable and thought nothing could tear them apart. Then one night something happened between them, something that brought them even closer together... They didn't anticipate that what began as youthful sexual experimentation would lead them into an affair of the heart that would rock them to the core. Nor did they expect the danger of being discovered and separated by their families. At the time, neither Brandon or Zach realized that life would give them another opportunity. Now, ten years later, a chance meeting brings them together again. Let best-selling gay fiction author G.A. Hauser take you on an unforgettable journey. A coming of age story about faith, about courage, and about trust...you'll never forget The Boy Next Door.

The one I have just has the guy in the pool on cover but couldn't find it to post here.

I enjoyed this more after they became adults.