B Negative (2019)

Barry wants to have vicarious immortality through his children but finds he can't have kids. His friend invites him to a private club, The Ancient Order Of Nocturnal Immortal Phlebotomists Of Albion, whose members live forever by sucking the blood of others. However, their membership is literally dying out so Barry tries to help with their marketing, something he has never done before, and carries out various unpalatable tasks in return for gaining true immortality.