March Reward 4 (Patreon)

Ulf is chief and last surviving alpha of a clan in danger of dying out. Fortunately, he's strong as ever despite his getting on in years, which comes in handy when he leads his warriors in a surprise attack against a larger clan that had been encroaching on his territory for some time. Ulf and the betas that follow him manage to rout the enemy and while looting their camp for useful supplies, come across something infinitely more valuable than fine furs or steel blades...

Three omegas.

Taken captive by the other clan when their own were defeated, the omegas decide to take Ulf up on his offer to join his tribe. The only thing he asks in return is they each bear him a child in hopes of birthing another alpha to take over when he inevitably passes. They agree and take to the task with gusto when they find just how well endowed (and attentive) their new alpha is. They all manage to conceive rather quickly but while Ulf had intended to leave it at that and allow the trio to find themselves partners among the betas in his clan, they surprise him when they all insist on staying by his side. 

While each would prefer to half Ulf to themselves, they've become fond enough of each other to settle on sharing the alpha. There's plenty of him to go around, after all.