His Treasured Mate by Julie Trettel

Being Alpha is a fulltime job, but so is being a mate, father, son, brother, and friend.
The weight of the Pack sits upon my shoulders and there are few that know what that feels like.
I thought we were done having kids, but my mate is pregnant again. With four daughters and a possible fifth on the way, the fate of Collier Pack has come into question. Other Packs are accepting firstborn daughters in the line of succession and my oldest is training to take her place. But others hold firm to the old ways and want me to magically give then a son, a true heir, or else.
One last pregnancy.
One final chance at an heir.
One challenge to me as Alpha.
If I want to keep this Pack together, I’m going to have to show them all exactly why I’m the Alpha!