Mairead Philpott tells the court that she started having sex with other men before Christmas.
She says Mick was always present and that he would encourage it and agreed he would get involved.
On the night of the fire, Mairead says she had sex with fellow defendant Paul Mosely - something Mick would "encourage and join in" with.
This had taken place before the fire and Mairead said she felt "disgusted" afterwards, but that she did it to make Mick happy.
She says she was "really hurt" when Mick asked her for a divorce, but that she never thought about leaving.
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A deal is believed to have been reached with official confirmation likely on Friday.
The woman is described as being around 50 years old with short spikey purple hair.
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