Storming for His Omega by Harper B. Cole

With great love comes great responsibility…
Alpha Storm Wayne works for the LAPD, but he moonlights as Detective Lightning, the brawniest and strongest of the group of superheroes known as the Defenders. They also happen to be his brothers, and these days, Storm is a little jealous that his older brother has found happiness.
Then an omega comes to him, asking for help. An omega who Storm quickly realizes is his Elemental Omega, the only person he can hope to have a future with. And this meeting sparks emotions so intense, Storm takes the case.
Omega Declan Palmer is in trouble from his ex, an alpha named John Moulton. John is threatening something bad, and Declan turns to the LAPD for his help.
Little does he know that his meeting with the very gorgeous alpha detective will change his life.
But between John’s threats and a new threat in the form of the supervillain known as The Manipulator, Storm and Declan will have to do everything they can to save day. Especially with a baby on the way.