Mercedes's romance with Riley (Rob Norbury) hit the rocks last month when she confessed to her affair with his dad Carl (Paul Opacic). She made her admission on her wedding day, just as she was about to say her vows.
Since then, Mercedes has given birth to a baby boy named Bobby, and although she is unsure of who the father is, she starts using her newborn to win Riley back in upcoming episodes.
Metcalfe told Soaplife: "Mercy has taken to the baby quite well, but I think that's because she thinks she's going to get Riley back.
"She's got all these little ploys. She turns up with the baby unannounced and says stuff like, 'What a lovely family we are'. Then when Riley turns up at hers she bans him from seeing the baby."
The actress added that she would be happy to portray Mercedes as a singleton if her schemes proved unsuccessful.
"I'd like to see Riley and Mercy get back together and try again, but you have to remember that this is soap," she explained. "And I do quite like playing Mercy when she's on her own and exploring other men. That's when she's at her best!"
Asked whether Mercedes and Carl could reunite, she replied: "Both he and Mercedes have realised what they did was disgusting and they have put it to bed, even though there's still a lot of chemistry between them. A resumption of the affair is definitely not on the cards at the moment."
Hollyoaks viewers will find out whether Bobby's father is Riley or Carl next week.
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Re-watch Mercedes's wedding day confession in the video below: