The pair have been secretly meeting up over the last week, while Liam’s wife Maria grieves the loss of her baby.
Liam's passionate clinch with sister-in-law Carla is videoed on a mobile phone by Rosie Webster.
Rob James Collier, who plays Liam, has announced he is leaving the show and is sure to make a dramatic exit.
The 31-year-old was recently named Sexiest Male at the British Soap Awards.
How does Coronation Street help with sex education?