A 26-year-old man sexually assaulted and raped a teenage girl after lacing the drinks of guests at a party, a court heard.

Darren Fellows groped the 16-year-old girl after they were left alone in a room of the house when other guests became drunk, Bradford Crown Court was told.

Prosecutor Richard Newbury told a jury that Fellows laced the drinks of people at the party with vodka and offered his victim alcopops, telling her it was a fruit drink.

Mr Newbury said the girl, who cannot be identified, spoke to her boyfriend on her mobile phone while Fellows lay on the living room sofa, apparently asleep.

But when she got up and walked past him, he grabbed her wrists, pulled her on to the sofa and asked her to lay down beside him.

When the girl refused and remained seated he lifted her fully on to the sofa, touched her breasts under her clothing and further indecently assaulted her, Mr Newbury alleged.

He said: "She says he was pinning her to the sofa and had moved into a position where he was on top. She was saying such things as: Stop, I am only 16.' "She tried to raise her voice as she told him to get off. This caused the defendant to cover her mouth with his hand and he told her to be quiet. She says he resisted her attempts to get up and her attempts to get him off."

Mr Newbury said the girl alleged Fellows twice pulled her trousers down and loosened his own, tried to kiss her, fondled her breasts again and then briefly raped her. The prosecutor said Fellows was not wearing a condom and the girl was crying and telling him not to.

The defendant got up but when the girl said she was going to tell someone what had happened he pinned her against a door and ordered her to be silent, it was claimed.

Fellows left the party and the police were alerted. He was arrested and interviewed and initially told police he had had no contact with the girl.

Later he claimed she was lying next to him and started kissing him. He said she sat on top of him and they were kissing and "playing about" but when he laid on top of her she told him: "I can't do this, I've got a boyfriend."

Fellows, of Thornbury Avenue, Thornbury, Bradford, has pleaded not guilty to two charges of sexual assault and one of rape on June 27 this year.

The trial continues.