Viewers have seen Pierce (played by Jonathan Wrather) gradually becoming more controlling towards his girlfriend Rhona (Zoe) over several months.
Last month, fans of the soap were horrified when Pierce appeared to force himself on Rhona on two separate occasions.
In an exclusive interview with Express.co.uk, Zoe said the awkward scenes were "the tip of a big iceberg", hinting that the worst was still to come.
"Without saying too much, I think that incident is the tip of a big iceberg," she said. "I think it was a situation which Rhona wished hadn't happened. She brushed it off in the pub the next day."
The first incident had happened after the couple had made up from an argument, Pierce pushed himself on Rhona despite her saying she was not interested.
The camera cut away and returned with Rhona looking upset as she got dressed again, with many viewers concluding the mother-of-one had been raped by her boyfriend.
Zoe, 43, has said she believes Rhona might have consented away from the camera.
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It's a really complex situation
"It's a really complex situation. I can't say it was rape and I can't say it wasn't rape," she explained.
"I just know that she was put in a position where she felt uncomfortable and she struggled with how she felt afterwards. She resolved it for herself the next day and decided to put it behind her."
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Pierce has had a difficult year, in which his first wife died unexpectedly and he later discovered she had been having an affair with Paddy Kirk (Dominic Brunt).
Emmerdale viewers were shocked when Pierce pushed himself on Rhona last month
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However, actor Jonathan has suggested his character's manipulative ways are a result of something that happened in his childhood, explaining that Pierce has a long history of obsessive behaviour.
"We've had little glimpses from Pierce's past," he said. "It's the horn of something that goes way back, which he hasn't really dealt with from his earlier childhood."
Jonathan added: "He does feel the need for things to be right and he strives for perfection. He's tireless- it's compulsive behaviour."
Emmerdale continues tonight at 7pm on ITV.