The on-off couple share a kiss in the soap's 2012 season finale week, bringing them together for the first time since Natalie dumped Brax after their adventure in the desert.
Peacocke told TV Week: "What brought them together initially was Natalie working with Casey and it's been on again, off again, but they realise there are still feelings between them.
"There's a history between them now. They know more about each other and he would like to be with her."
However, it seems that the pair's troubles are not over, as Brax is given food for thought when John Palmer rebukes him for spending time with unsavoury characters like Adam Sharpe.
Reminded of his tragic relationship with Charlie Buckton, Brax realises that it may be best to stay away from Natalie (Catherine Mack) for her own sake.
Peacocke added: "It touches a raw nerve because [John] reminds Brax of what he is. Brax has got this tattoo on his hand that reminds him that he had the love of his life [Charlie] and she's gone because of him."
Whatever happens, viewers can expect more twists and turns between the duo in 2013 as Natalie's ex-boyfriend will arrive in the Bay, which leaves Brax feeling threatened.
Peacocke confirmed: "He's a bit of an alpha male, Brax is, and he does go into domination mode!"
Home and Away airs its 2012 season finale on Wednesday (November 28) on Network Seven in Australia, and in February on Channel 5 in the UK.