Andy sleeps with Amy Wyatt's mother Kerry (Laura Norton) next week, and they later agree to enjoy a 'no strings attached' relationship.
The pair's passionate encounter takes place after Andy agrees to let a lonely Kerry stay with him for a few days.
Asked whether Andy could end up falling in love with Kerry, Fletcher told All About Soap: "No, I don't think so. The problem is that they're just too alike, and if they stayed together they'd get themselves into too much bother!
"But sometimes being similar can be a good thing, so we'll see."
Predicting that his alter ego's attentions could turn elsewhere, he continued: "Andy may be on the hunt for another woman in the next few weeks. He's like the village bike - everyone has had a ride!"
Andy and Kerry's relationship begins in Wednesday night's (September 5) episode.