Viewers have watched in horror as Xanthe Canning (played by Lilly Van der Meer) has been growing inappropriately closer to her teacher Finn Kelly (Rob Mills).
Now Jackie, who plays Susan Kennedy in the Australian soap, has suggested that the school girl's problems are only going to get worse.
Speaking exclusively to Express.co.uk, the 61-year-old teased: "He is going to take her to places that are very dangerous to her.
Xanthe and Finn have been getting close to each other but will he put her in danger?
Finn has been clawing at Susan but will he win?
He is going to take her to places that are very dangerous to her
"He oversteps his boundaries and he convinces her to go somewhere with him and without her family knowing where she is.
"There's that panic of where she is and trying to get her back before it's too late."
"He puts his own agenda before anyone else," Jackie hinted.
The star also suggested Neighbours viewers haven't seen the worst of Finn, as he crawls his way to the top of the school.
Neighbours kids then & now Fri, January 20, 2017
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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
Jackie continued: "That's not the worst. He comes in as acting principle and causes a lot of damage to the school.
"He causes a lot of grief and [Susan] has a legitimate reason to get back and get the school back.
"But he does a lot of things that put people at risk several times. He feels justified in taking risks with other people," she finished.