One Breath to the Next (Hermosa Beach Memoirs #1)
Danube Adele

Mason is ex-military with PTSD and torturous secrets that are forever locked in his mind. He isolates himself from attachments at the same time that his dark, brooding gaze tracks Layla, the girl he's silently obsessed with. Then one day, she comes to him with a proposal.
Layla is fiercely single, a survivor of her own past, but when a single look from Mason makes her body burn with newfound desire, she finds the courage to approach him. Her offer? Sex with no strings, no hearts, no flowers. Definitely no commitment.
It seems the perfect arrangement, unless their hearts decide they are perfect for each other.