Condou believes that Marcus, who shocks himself when he shares a kiss with a woman this Friday, could have a unique bond with best friend Maria.
Exploring the aftermath in an interview with Soaplife, the actor said: "He doesn't understand why the kiss happened, but in his head because he's a gay man it must be just that they got carried away in the moment.
"As time goes on, though, he begins to realise there is more there and that makes it even more confusing for him because he starts to wonder who he is."
However, he added: "Marcus is gay and I don't believe that if things don't work out with Maria he will suddenly start fancying Michelle or Tina.
"This is about one particular person; there is something about Maria and their relationship and it has moved over into something else. That's what is so confusing for him."
Following Maria's breast cancer scare, the pair embrace in their flat before joining Eileen's surprise birthday party, where Marcus's boyfriend Aiden and Maria's boyfriend Jason are waiting.
Coronation Street airs these scenes this Friday at 7.30pm and 8.30pm on ITV1.