A child was sexually abused, beaten and forced to eat his own vomit by carers, Leicester Crown Court has heard.
Sandra Rainford, 52, formerly of Delaware Road, Evington, Leicester, and her 55-year-old sister, Edna Rainford, of Wand Street, Belgrave, are on trial.
Both deny ill-treatment and assault while Sandra also denies having sexual activity with a child aged under 13.
The court heard the boy, now 13, was often tied up naked when he stayed with Sandra in late 2008.
The boy, whose mother was in Jamaica, had been staying with various friends and relatives until he was left with Sandra Rainford for several weeks, the court was told.
In a videotaped interview with police which was played to the court, the boy, who cannot be identified, described being beaten with wooden sticks, stabbed in the shoulder with a fork and forced to eat chilli peppers as well as his own vomit.
He said: "She gave me a cup, I had to vomit in that and then drink it.
"If I spilled any I had to suck it up and lick it up off the floor.
"Sometimes when she has hit me with a wire she gets vinegar and water and puts it in a spray bottle and sprayed it on my back.
"My back starts stinging and itching."
The court heard police were called to the house three times after neighbours heard the boy screaming, but Sandra Rainford claimed to be alone.
He also described being given a drink which made him feel tired and waking up to find himself naked with her in bed.
He said on another day he was bound and gagged by Edna Rainford, known as "Pam", before both sisters started hitting him.
In the videotape, the boy also described being made to wash his clothes in cold water outside naked until the early hours after Sandra Rainford told him she was going to throw him out of the house.
The court heard a relative of the sisters noticed the marks on his body and took him to a friend, who called the police.
The case continues.