Gladio, Ignis and Noctis are a bonded Alpha pack. They love each other, but they won't be complete until they find their perfect omega. Bonded packs of all Alpha's rarely work without an omega or beta, as none of the alphas will submit to each other.
After a night out, the bros are heading home when they hear whimpering coming from an alley. Curious, they decide to investigate the source and are horrified to find a small, blond omega inside a dumpster bin. The omega is clearly starving, beaten and ill. Despite this, he's still the most beautiful creature the Alphas have ever seen and they all fall instantly in love with him. The bro's quickly pull him from the dumpster and hurry him to their quarters.

Over the next few weeks, the Alpha's slowly nurse the omega named Prompto back to health. Prompto is sweet and shy, and also desperate for any and all affection. The bros dote on the little omega and ensure that he's always held, praised and comforted.

Eventually, the Alpha's claim Prompto as their long sought after omega mate.

+Prompto is a victim of the illegal sex slavery trade in Insomnia. He was thrown in the dumpster because he was sick, and his owner didn't want to pay for his medical care. Thus, he was left to die.
++ Prompto loves to be cuddled and sit in people's laps
+++Prompto doesn't talk much, but he makes up for his quietness and smiles and hugs