Moira (Natalie J Robb) continues her secret relationship with Alex Moss (Kurtis Stacey) in the coming days, but the farmhand finds himself torn between two women as he also reunites with on-off girlfriend Victoria Sugden.
Spoilers for the end of next week have revealed that Alex and Moira will finally be caught out when Fletcher's character Andy catches them kissing.
While Andy fears that Victoria (Isabel Hodgins) will be devastated if the truth comes out, the situation is soon taken out of his hands - resulting in Moira's secret becoming the talk of the village.
Fletcher told Soaplife: "[Andy is] very shocked Alex is cheating on his sister. He tells Alex to finish with Victoria and do it nicely and, if he does, the Alex/Moira thing won't be made public.
"But Moira eventually has to admit the affair, and the whole secret comes out."
Early reports have suggested that Victoria is suspicious when Alex suddenly dumps her, so she demands to know if there is another woman.
When an under-pressure Moira intervenes by confessing that she is the mystery lady in question, Victoria reportedly gets her revenge by publicly announcing the affair at The Woolpack.
With Moira's recent antics out in the open, viewers will have to wait and see how her son Adam will react to the news.
Emmerdale airs these scenes on Monday, September 10 at 7pm on ITV1.