The actresses, who play Sophie Webster and Sian Powers respectively, will reportedly have a same-sex romance on the show next year.
Brooke told The Sun at the Inside Soap Awards: "We've talked about it, we're so close so we'll be alright. I've just told her as long as she sticks to her own side when it comes to the kissing scenes things will be fine. But no tongues!
"I think the story's going to be really good, it's something to get my teeth into and it will take Sophie out of Rosie's shadow."
She added: "It will also let other teenage girls know they are not the only ones going through it if they are experiencing something similar.
"Often there aren't as many lesbian characters on TV compared to gay ones so it's a really positive thing for the soap."
> Click here to watch our interview with Brooke and Sacha about next year's storyline