Cannibal murders parents then has s3x with their dead bodies before EATING parts of remains

A 25-year old man killed his biological mother and stepfather with the help of his 22-year old stepsister-cum-lover, had sex with the corpses and then fed them to dogs.

According to Mirror:

Leandro Acosta, killed mum Miryam Kowalczuk, 50, and stepfather Ricardo Klein, but also had sex with their bodies and then ate some of their remains. He then cut up the rest and burnt it before feeding it to the family's six dogs.
Acosta and his lover justified their actions by accusing the deceased couple of abusing them in the past and had also started abusing the two children they had together, 11-year-old twins.
They said they had reported the matter to police, and when nothing happened, they had decided to take the law into their own hands.
So they waited until the twins were at school and then carried out the killings at the family home in the city of Pilar, in the east Argentine province of Buenos Aires.
The stepfather was shot in his sleep, while Acosta shot his mother as she walked into the house.