Opemipo Jaji, 18, admitted sexually assaulting and robbing the girl in 2011, the Old Bailey heard.
He is on trial accused of following a girl home from school on a bus last November before dragging her into a park in Enfield, north London, and raping her.
Mr Jaji, of Edmonton, denies rape.
The court heard the girl was subjected to a three-hour ordeal in Jubilee
Mr Jaji followed her and dragged her into Jubilee Park and subjected her to a three-hour ordeal, the Old Bailey heard.
Her glove had been stuffed in her mouth and she had been stripped and assaulted
DNA in park
The girl ran home dishevelled and bleeding and later underwent surgery
for her injuries.
Mr Jaji said he was not the attacker, although he was on the same bus.
He claims her DNA on his bag, trainer shoe and the waistband of his boxer shorts was from when he went into the park later that evening, the jury heard.
But Rosina Cottage, QC, prosecuting, said it was "not a coincidence" that Mr Jaji had sexually assaulted and robbed a girl before.
Miss Cottage said a tie had been placed in that girl's mouth by Mr Jaji.
She added: "He had an interest in pre-pubescent girls and sexual acts with pre-pubescent girls."
Mr Jaji had been arrested a few days later after CCTV was viewed, and his bedroom searched.