Rejected by the Alpha, Claimed by Another Pack

At my birthday party, my fiancé's widowed sister-in-law Lira announced to everyone:

"I'm pregnant, and the child is Kael's."

Kael, my fiancé, the current Alpha of Blackrock Pack.

I looked at Kael, waiting for him to deny it, but he lowered his eyes and nodded coolly:

"The child is mine. My brother died under Rogue claws trying to save me. I owe him my life, so now I'm giving him a child in return. Consider it repayment."

Then he finally raised his head to look at me, without a trace of apology in his eyes: