Ryan is currently enjoying a fling with scheming Tracy (Kate Ford), unaware that she is only dating him to make life difficult for his mum Michelle (Kym Lomas).
Tracy's ultimate aim is to make sure that Michelle splits from Steve McDonald (Simon Gregson), as she still has strong feelings for the Weatherfield cabbie.
Heras told Inside Soap: "The fact that Tracy still has feelings for Steve hasn't entered Ryan's head. As far as Ryan can see, he's having a bit of fun with Tracy - but they have not taken precautions which has led to her becoming pregnant.
"Michelle tries to make Ryan see that Tracy's bad news, but he thinks she's stopping him having fun, so he doesn't heed her advice."
However, he continued: "Ryan will eventually realise that Tracy is poison and that his mum and Steve have been right all along. Tracy will falter at some point, and Michelle will be there to pick up the pieces for him."
Tracy's latest setback is expected to come later this month as this fortnight's All About Soap reports that she is exposed for lying about her 'pregnancy'.
Fearing that her schemes have gone too far when loyal Ryan proposes to her, Tracy apparently declares that she has lost the baby - but it's clear to everyone that she was lying all along.
Coronation Street continues tonight (October 10) at 7.30pm on ITV1.