Seasons 3 and 4 I'd keep pretty much the same. It's only Season 5 I'd change. I know some people think that Cole was unforgivable da the time he'd become the Source, but I disagree. It wasn't as if he'd done that deliberately - he'd tried fighting it.

I'd start off the same way. Cole returning from the Wasteland, trying to win Phoebe back because he still loves her, her unable to accept him because she doesn't trust the effect she has on him. That's realistic. Then he'd back off, try to just prove he can be a good person. Try to just be a friend/ally if he can't be her lover. Maybe I'd still...

Cole: te have no idea what you're getting yourself into.
Phoebe: Neither do you.

Phoebe: "I'm making la minestra, zuppa for Cole, he'll eat it in a bowl. I guess that's my new role, just making la minestra, zuppa for Cole."

Cole: Uh, Phoebe?
Phoebe: Cole! What are te doing here?
Cole: Well, I got a call from one of the tenants saying that, uh,
Wonder Woman was terrorising the landlord.

Cole: I'm a one woman demon.

Piper:"You were at Cole's all night?
Phoebe:"Uh huh."
Piper:"Did you?"
Phoebe:"Uh huh."
Piper:"Was he?"
Phoebe:"Uh huh."

(when cole and phoebe are fighting and he lands on superiore, in alto of her)
Phoebe: If te wanted to be on superiore, in alto you...