Crying Out Loud by Lorelei M. Hart

A crush that turns into an unforgettable night…
Cam is the odd man out, the only Omega firefighter in Millerstown. He doesn’t have the traditional body of an Omega and doesn’t act like one either, which is why he’s sure nothing will ever happen with his crush on the older Police Chief, Derek Williams.
…with unforgettable consequences.
It was just a night of passion, never to be repeated. At least that’s what Derek tells himself. Cam is too young, he needs someone closer to his age who can treat him with tender kindness, not a hardened police chief who has seen way more than he ever wanted to.
Except, when Derek discovers Cam is in trouble, he doesn’t blink before breaking Cam’s door down. At the hospital they both get a big surprise. Cam is expecting Derek’s child. Now all Derek has to do is become the Alpha his Omega needs while protecting him from the criminal who wants revenge.