A Bexleyheath Academy assistant vice-principal took a pupil's virginity in a classroom and gave her a Fifty Shades of Grey key ring for Christmas, a court heard.

Inner London Crown Court was told today how Stuart Kerner - a married father-of-one - gave the girl the trinket, telling her "he thought it would be an appropriate gift".

Kerner, 44, from Aylesford, is accused of six counts of sexual activity with a child and two counts of sexual activity with a child by a person in a position of trust.

The relationship allegedly took place between March 2011 and November 2012.

The girl, who cannot be named for legal reasons, was 15 and 16 years old at the time.

In a police interview, shown to Inner London Crown Court, she said: "I'd always wanted to have sex with him.

"I'd known from the start that I had and when he said something about it I made sure it was going to happen."

She added Kerner, a religious education, ethics and politics teacher, had previously pulled out a condom and said to her "this is in case you become irresistible".

She told the court she lost her virginity to him in a classroom at Bexleyheath Academy in February 2012.

The girl said: "So we arranged to have sex on the Tuesday and I thought 'OK, this can only get better'.

"He said go to this room fourth lesson.

"I ran to this room and a couple of seconds later I heard his footsteps walking down the corridor.

"I literally just grabbed him and started kissing him.

"He laid a yoga mat on the floor and put the blanket over the mat.

"When he finished he came back and started kissing me. He said 'what do you want me to do?' and I said 'f*** me'."

Then the pair had sex.

On Wednesday October 3, 2012, Kerner, who worked from home on Wednesdays, invited the girl to his house.

She said: "He said 'what are you doing on Wednesday? How about you come to my house'.

"We met at Crook Log Leisure Centre. He picked me up at about 9.30ish, took me back to his house.

"It was probably one of the best days I can remember, just being with him.

"At this point I had never actually seen him fully naked. He always wears a chain around his neck which I had never seen before."

Kerner and the pupil had sex three times over the course of the day.

She added: "We had breaks. We had lunch. He made me toast and marmite in his kitchen, watching Bargain Hunt.

"I sat at the bottom of the stairs, completely naked, watching him. He saw me and smiled."

The court heard the last time they had sex was in November 2012, in an instruments store at the school.

In the police interview the girl was also able to describe specifics of Kerner's physical appearance, including a scar on his back from having a mole removed.

He denies all charges.

The trial continues.