While Roy (David Neilson) and Hayley (Julie Hesmondhalgh) grapple with how to tell everyone their unfortunate news, Peter (Chris Gascoyne) and Tina (Michelle Keegan) will give in to temptation and risk breaking Carla's (Allison King) heart on Coronation Street.

Roy and Hayley discovered the cancer has officially consumed her and left her with only weeks to live. She is devastated by the news and leaves Roy to tell everyone. As he begins to make his rounds and winds up at Peter's flat to collect a bag he left there, he nearly catches a secret encounter between the newly-married Mr. Barlow and Tina.

Coronation Street: Friday, Dec. 27, 2013

Peter and Tina kissed before he recent wedding to Carla. Tina has been trying to make Peter jealous ever since, even by kissing Rob (Marc Baylis) before Christmas. After Peter's brother-in-law made an off-handed remark about his fancying the babysitter, Peter punched him, causing Tina to storm into the flat and confront him over his actions. Fury will turn into passion as the two lose their fight against temptation. However, the two risk getting caught after Roy comes into the flat.

In an interview with Radio Times, Gascoyne opened up about how Peter sees the affair.

"In Peter's mind, as long as he's warned Tina about how dangerous it could all get, then he's done all he can to protect her," he said. "It's up to her then if she wants to continue what they've got."

He also revealed more insight into the character's inability to stay away from Tina, and the possible consequences he will face if he is caught with her.

"He's got an addictive personality and if temptation comes into his sight he can't resist it," Gascoyne revealed. "[His career and marriage ending] is why he tells Tina they need to stop what they are doing and states to her that he loves Carla, not her. But when he starts to see Tina as being unattainable and when she kisses Rob, that makes him want her all over again. He can't help himself."

Coronation Street: Friday, Dec. 20, 2013

Watch clips of Tina and Peter giving into their desires in the Dec. 23 episode, as well as Tina kissing Rob, below.

Coronation Street airs Monday, Dec. 30 at 7:30 p.m. on ITV.