Rachel Marshall, 42, pleaded guilty to having sex with a 15-year-old at Caernarfon Crown Court, North Wales.
The revelation has torn her 19-year marriage apart after her arrest on March 30.
The shoe shop worker from Llandudno, North Wales, admitted to four counts of sexual activity with a child between October 2014 and February 2015.
“She’s lost everything, her marriage, her home.
“The court ought to look into everything before embarking on sentencing.”
He also requested a psychiatric report, according to The Sun.
Judge Philip Harris-Jenkins adjourned sentencing until December 2 and granted Marshall conditional bail.
But he warned the shamed mum: “Please don’t read anything into the fact I am adjourning the case.
“This is a case where custody is inevitable so prepare yourself for a custodial sentence.”
Marshall is banned from being in contact with boys under 18.
She wore black for the short hearing.