Buck

Buck is an animal in Fertile Breeder, capable of impregnating the Courier.

Background
Not much is known about Buck’s past. He was a regular Bighorner living as the Holt Family pet. Sometime before the events of Fallout: New Vegas, Buck mounted Marion, the younger sister of the two Holt daughters. Upon impregnating her, causing the family to discover the Breeder Mutation, Buck became the breeding stud of the family, breeding both Marion and Laura.

Buck spends most of his day in his pen, and often mounts the girls in the family. If the Courier decides to spread the mutation, Buck will eventually impregnate most women in Goodsprings, as well as many travelers.