Jailed Mairead Philpott wants to divorce her husband Mick Philpott so she can start a relationship with the man who helped the couple start the fire which killed their six children.
Mairead, 33,has told fellow prisoners that she plans to file divorce papers while she and Mick are behind bars.
According to The Sun she is hoping to be free in seven years and has been writing to Paul Mosley, 47, the couple's threesome sex partner who helped torch their Derby home.
Mosley and Mairead were found guilty of manslaughter and given 17-year sentences for their part in the crime, so both will be freed at the same time.
A source told the paper: "She wants to see Mosley as soon as they get out. It's a love triangle from hell.
"She has finally realised what a swine Mick is - plus he could still be inside for years after she is out.
"She's telling the others in jail she wants a divorce."
Philpott, who has 17 kids, got Mosley and his wife to help him set their council house on fire, hoping to frame an ex he wanted revenge on.
He was sentenced to life imprisonment for manslaughter in April last year.
The deaths of Duwayne, 13, Jade, 10, John, nine, Jack, seven, Jesse, six and Jayden, five, horrified the nation.
Last year, Mairead, who is in Bronzefield women's prison in Surrey, said Mick was the 'best father ever' in a letter she sent to him in Wakefield jail. She said she would always be proud to be 'Mrs Mick Philpott'.