A female deputy head of a special school had sex with one of her pupils four times in the toilets of the British Library, a court heard today.
Teresa McKenzie, 39, had a 14-month affair with the boy when he was 16 and 17, the court was told.
She sent him love notes found in a bag with condoms and KY Jelly, it is alleged, and phoned and emailed him 600 times.
McKenzie also told the boy's mother she loved him and would resign from her job, Chester Crown Court heard today.
McKenzie and the boy met when she began work at the Cheshire special school in February 2006.
Soon after, she became his "key worker" and he became infatuated and would follow her around "like a lost dog".
Simon Mills, prosecuting, said an illicit relationship began which culminated in August 2008 when McKenzie had sex with the boy in the toilets of the British Library.
The youngster, who has attention deficit hyperactivity disorder, emotionally disturbed behaviour and oppositional defiant disorder, was at a holiday camp with his family in Kent.
He was not enjoying it and his mother allowed him to return to his home city of London to meet McKenzie.
Mr Mills said McKenzie had been to see the boy the previous March when they had sex in the Cumberland Hotel.
But he said of the British Library: "The second time they snuck into the disabled toilets on different floors and had penetrative sex four times."
The barrister also said letters and notes were found in the teenager's rented home in Cheshire from McKenzie.
One said: "Sweet love heart, I hope you are well this morning. I long to see you. Such sweet anticipation makes my heart race.
"I won't be able to concentrate in the meeting thinking about your beautiful eyes, strawberry and cream hair, soft hands, gorgeous laugh, strong shoulders and delicious lips.
"I could go on but you would tell me off for all the compliments - Lol!
"I love you forever," which was signed off with 30 kisses.
Another note found along with KY Jelly and condoms in a gift bag with a pirate on it was addressed to "my gorgeous pirate".
"I'm dreaming of hiring a pirate ship with you and sailing across the seven seas," she allegedly wrote.
"We could find a deserted island with just palm trees and lapping waves and hot sun. Do you think you would like to come?"
It went on that they could "forget everything and everyone - it would be bliss.
"I will love you forever and ever and ever."
McKenzie, of Meifod, Powys, formerly Chester Road, Tarporley, told police the letters were to support the teenager, "a very troubled young man", said Mr Mills.
She denies seven counts of sexual activity with a child by a person in a position of trust.