I fell in love with this ship and I'm jotting down a couple of ideas 😍❤️🥳
Slade finds a Nightwing rejuvenated to the age of 10/12 and with all the memories of that age.
Dick ran afoul of a magic user who made him look like this.
Slade has the onerous task of bringing him back to Bruce because he wants nothing to do with this magical bullshit and they find themselves hunted by the wizard.
During the trip he finds himself babysitting a hyperactive and talkative child who has a growing fascination and attachment to him.
Furthermore, Slade will have to protect him from magical creatures unleashed by the wizard to bring little Robin back, proving his skill and cunning to the child.
In the end he leaves Dick in Bruce's arms and our Batman, all worried, asks his son: "What did Deathstroke do to you?".
Dick with a big smile replies, "I want to marry that man".