The Summer Ultimatum by Amanda Shelley

Watching my sister fall in love last summer gave me something I hadn’t expected—hope. It gave me hope that there might be someone out there for me and hope that I might get past my misguided fears and finally let someone in.
With my help, Ryan’s planning the most epic proposal. I just have to get the know-it-all musician I work with to fall in line to make it work.
Jax is wicked smart, extremely talented, and sexy as sin. But he can’t see the forest for the trees when it comes to his potential. He’d rather keep playing in dive bars along the coast than take a real shot at success.
When the Seaside festival has a music competition, I present Jax with an ultimatum that will either make or break both our careers.
I’ve laid it all on the line, but can he?