How to Turn Sims into Werewolves in The Sims 4
If you want werewolves to take over the world you’ll need to turn sims into werewolves in The Sims 4.
Of course if you own The Sims 4: Werewolves you’ll want to have true world domination!
This is a requirement for the Wildfang Renegade aspiration too.
Curse Bearer Werewolf Perk
If you want to turn other sims into werewolves you’ll first need to unlock that ability by purchasing the curse bearer werewolf perk. This perk is available to you at rank three of being a werewolf, so you’ll need some werewolf experience gained before being able to get it.

How to Turn Sims into Werewolves in The Sims 4
Once you purchase the curse bearer perk for your werewolf you have two options. You can either ask permission to turn a sim which is the nice way to do it, or you can give them the cursed bite without permission which is the mean way.
Asking Permission to Turn Sims into Werewolves
If you want to ask permission you can go into the social menu and find ask if Sim wants to become werewolf.

Depending on your relationship the sim will have different reactions. If you have a low friendship with this sim you’ll get a notification saying no but it’ll say I might change my mind if I knew you better.

If you get that notification, work on your friendship with that sim by doing friendly interactions. Then, you can ask again and the notification will change to something like “I’m ready to be a werewolf! Let’s do this.”

When they say yes your sim will go ahead and bite the other sim and they will start the process of becoming a werewolf including going into their first fury induced rampage.
Turning Sims into Werewolves Without Permission
If you want to do it without permission you can click on another sim and do the cursed bite interaction. The animation for this without permission looks a bit meaner and more violent than when you ask.

This will start the process of them becoming a werewolf and most likely give them a +3 scared moodlet from being bit out of the blue.
Being able to turn sims into werewolves allows you to finish the Wildfang Renegade aspiration and gives you the option to turn the entire world into werewolves if you want!