His to Keep by Tory Baker

He let her go once. He’s not going to let her slip away a second time.
Trey Johnson’s longing for his best friend’s younger sister, Sienna, has always been a source of heartache. He let her go to chase her dreams and spent every waking moment regretting his decision. Now that Sienna is back, Trey is ready to make his move.
Determined to win Sienna’s heart and keep her by his side forever, Trey is prepared to risk it all. He’s going to prove that his love is more than just words—it’s a promise he intends to keep.