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Louis Kukuruzovic broke into the victim’s home and forced her into a bedroom before assaulting her.

Bradford Crown Court heard he carried out the attack to satisfy his fetish for women’s underwear.

Kukuruzovic, 20, pleaded guilty to sexual assault and robbery.

He was jailed for 10 years by Judge Jonathan Rose, who branded the crime “the stuff of nightmares”.

Sophie Drake, prosecuting, said the victim had been more than six months pregnant.

She was wearing a maternity nightgown when she answered the door to her attacker’s repeated knocking after dark.

The court heard how the victim thought it was a Halloween prank before Kukuruzovic pushed past her, launched his attack, and stole her underwear.

Stephen Wood, defending, said Kukuruzovic was currently being held in a hospital for the mentally ill.

He added: “He has spoken at length about demands made upon him by voices.”