Rob Mills, who plays the scheming teacher, defended his character's relationship with the school girl (played by Lilly Van der Meer), insisting it isn't sexual.
He exclusively told Express.co.uk: "It's not sexually inappropriate, but professionally inappropriate for sure.
"He's having grown up conversations with a 13-year-old and it's definitely not on.
"He's definitely been blurring the line of friend and mentor and he's using her to keep that secret.
Xanthe and Finn have been growing close as the teacher plans to use the girl for his gains
Rob slammed the controversy, arguing that it wasn't "sexually inappropriate"
It's not sexually inappropriate, but professionally inappropriate for sure
"[Finn] is trying to stay ahead of everyone else but Xanthe is a smart girl; it's a scary downward spiral and there's nothing else he can do apart from keep lying to keep her in the dark," Rob revealed.
After the storyline gained some bad press in recent weeks, Rob was keen to defend their relationship.
The 34-year-old added: "I honestly don't think with Finn that there was an agenda there.
"He saw a vulnerability [in Xanthe] and thought, 'Yes, I could use that'; he's constantly thinking on the fly and he just choses the path less travelled.
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Neighbours kids then & now Fri, January 20, 2017
Neighbours stars then and now. Take a look at what kids from Erinsborough High did next.
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Libby Kennedy – Kym Valentine left Ramsay Street in 2008 and recently gave birth to her second child
"I think he genuinely cares for Xanthe as well – not in a creepy, sexual way – he just wants to see her reach her full potential," Rob explained.
This comes after Jackie Woodburne, who plays Susan Kennedy, suggested that things are about to get a whole lot worse for Xanthe.
The long-serving star hinted that Finn will take the young girl "to places that are very dangerous for her”.
Neighbours airs weekdays on Channel 5 at 1.45pm.