A nursery worker and two accomplices have pleaded guilty to carrying out a string of sex attacks on children as young as 18 months old.
Vanessa George, 39, admitted seven counts of sexual abuse and six counts of distributing and making indecent pictures of children.
She committed the crimes at Little Ted's Nursery in Plymouth, where she worked.
She denied one count of sexual assault, which was ordered by the judge at Bristol Crown Court to lie on file.
The full details of the charges the nursery worker admitted are too graphic to report.
They describe the most depraved and degrading of sexual assaults, perpetrated on the most vulnerable of victims.
Co-defendents Angela Allen and Colin Blanchard also admitted a string of charges relating to assault and child pornography.
Allen, 39, pleaded guilty to four child sex assaults and one count of distributing an indecent image.
George arrives in police van
The unemployed single mother from Nottingham wept as she stood in the dock.
Blanchard, also 39, pleaded guilty to 17 child pornography counts and two sexual assaults on children.
The computer parts salesman, from Rochdale, Lancs, also admitted a further charge of possessing extreme pornography.
There has been no suggestion of any financial motivation or coercion.
The abuse was carried out solely for the sexual gratification of George and her two co-defendants.
The three apparently first met on Facebook last year, but never actually met until they were led together into the dock at Bristol Crown Court.
The trio traded thousands of explicit email and text messages detailing horrific fantasies of child sex abuse.
Often they would share photos of the assaults, which were taken on their mobile phones.
One detective told Sky News they appeared to be engaged in a macabre contest to see who could come up with the most depraved idea.
Sky News has also learned George - who is married with two teenage children - even discussed with one of her accomplices the possibility of abducting a child.
Sky sources said the nursery worker emailed Blanchard detailing a visit to a railway station's public toilets, where she had seen a little boy standing on his own.
"It would have been," she is said to have written, "the perfect opportunity to snatch him".
Blanchard reportedly replied asking whether she would drug children for him.
Police have said they will now never know whether this was pure fantasy, or the beginnings of a plan.
The trio will be sentenced on November 13.
Nursery Abuse: Trio Admit String Of Child Sexual Assault Offences | UK News | Sky News