Katlego Marite, 13, was dragged into a car while playing with two friends near his home in the Mpumalanga coal-mining city.
A Cape Town couple is believed to have been kidnapped by Isis.
The crime still chills the nation.
Venables said: 'I have had stupid urges.'
In recent Facebook posts, Michael Hunt, 43, had referred to the singer as his “queen” and had spoken of “tak[ing] off” with her.
He was also found with tickets to the singer's gig.
David and Louise Turpin pleaded not guilty on Thursday.
He was physically assaulted and humiliated.
A man was subjected to a 50 hour kidnap ordeal, during which he was physically abused, stripped naked, tied up and threatened
Child brides are still a shocking reality in South Africa.