Something happens and Nicky vanishes. The team end up bringing Booker back to help them try to find him.

Booker and Copley both try to find any trace of Nicky, and Booker is the one that does, only he doesn't tell anyone. Nicky has amnesia and doesn't remember anything after waking up, and apparently being immortal.

Booker goes to him, and starts telling Nicky that he tracked him down after dreaming about him. Booker is still a master forger, and he creates a fake life for Nicky, telling Nicky that Nicolas Smith just died and is now immortal, and how he'll teach Nicky everything he needs to know.

He takes Nicky to a safehouse the others don't know about, and basically lies to Nicky about how old he is, when he died, etc. Booker says that older immortals dream about newer immortal so that they can track them down, but that he was the last remaining immortal, until Nicky.

After they've been together for a while, Booker kisses Nicky and fucks him. Booker manipulates Nicky into loving him, thinking they're the only two immortals, and so meant to be together.

And then Copley tracks them down and sends the others after them...

(Just please make sure the ImmortalHusbands end up back together.)