A mom and her lesbian lover in Brazil have confessed to killing her nine-year-old the son and stuffing his body parts inside a suitcase and two backpacks - a year after they mutilated his genitals.

Rosana Auri da Silva Cândido, 29, and her partner Kacyla Pryscila Santiago Damasceno Pessoa, 28, told authorities they planned the murder in April after cutting off Rhuan Maycon da Silva Castro's penis and testicles last year to spite the boy’s father and paternal grandparents.

Da Silva Cândido told the Civil Police that she tried to improvise a vagina on her son and 'made sutures with rudimentary materials and avoided infections with procedures searched on the internet.'

Investigators from the Federal District Civil Police in Samambaia, Brasilia, said they believe the boy was mutilated some time in 2018 in the western city of Goiania.

The suspects told authorities they murdered da Silva Castro's on May 31 while he slept.

An autopsy revealed the child was stabbed at 11 times, twice in the heart.

Da Silva Castro's body also showed signs of burning.

Rhuan Maycon da Silva Castro (pictured with red shirt) was murdered by his mother, Rosana Auri da Silva Cândido, and her partner, Kacyla Pryscila Santiago Damasceno Pessoa, on May 31. The women admitted to police that they cut off his genitals a year ago

Rosana Auri da Silva Cândido (left)and her partner Kacyla Pryscila Santiago Damasceno Pesso (right) told authorities they planned the murder in April after they cut off Rhuan Maycon da Silva Castro's penis and testicles last year

Police said da Silva Castro's was stabbed by his mother while Santiago Damasceno Pessoa held him.

Da Silva Cândido said she continued to stab the little boy after Santiago Damasceno Pessoa used a cloth with acetone and placed it over his nose and mouth to render him unconscious.

The pair told instigators they used knives and a hammers to chop his body.

Santiago Damasceno Pessoa's eight-year-old daughter was awoken by the commotion and witnessed the barbaric act. According to cops, she was key in helping them solve the murder.

The boy's remains were placed on a barbecue grill but the smell was so strong that they stopped and put his body parts in school backpacks.

His face was disfigured.

'Ana wanted to fry his whole skin and wanted to cut the meat and throw it inside the toilet. The bones would be crushed so that it would actually disappear,' Santiago Damasceno Pessoa told reporters in a press conference.

Da Silva Cândido and Santiago Damasceno Pessoa were indicted and charged with intentional homicide, torture, concealment of corpse, serious bodily injury and tampering with the scene of a crime.

Police found the body parts of Rhuan Maycon da Silva Castro inside two backpacks. Pictured in Rhuan Maycon in an older photo

If convicted, both women could each face 57 year in prison.

Officials said da Silva Cândido was joined by Santiago Damasceno Pessoa when she fled Goiania with da Silva Castro and her partner's eight-year-old daughter about five years ago.

Lead investigator Guilherme Sousa Melo is also looking into accusations that the mother was beaten by her son's father and grandfather.

'The mother said that the boy was the source of all problems, she linked him to his father, who had mistreated her and they planned to kill him to start a new life without him,' Sousa Melo, according to Correio Braziliense.

Police were alerted by boys playing soccer after da Silva Cândido and Santiago Damasceno Pessoa were spotted dumped the suitcase containing da Silva Castro's body parts.

The rest of da Silva Castro's remains were found at their home inside two backpacks.

Both suspects are being kept in solitary confinement in separate cells without contact with other inmates at the Papuda Penitentiary Complex.