Destroy his life.

While the most rewarding it's also the most dangerous path, if you aren't careful you could end up as Zack's plaything or worse.
You shake your head clearing your head of those thoughts, you need to focus on the way you could execute this.
Take a breeder and sue for paternity, claim that he you to take a plus and have him arrested, create a fake persona, and destroy his social life with lies.
You also remember that purple pills exist and you could still make him your toy that way.

(If you want, you can add to this branch)