A court heard how Eppie Sprung Dawson, 26, had agreed to give the dyslexic teenager extra help with his lessons at the Catholic secondary where she worked.
But the married English teacher, who was only four years into her career, drove him to the countryside, stopped in a lay-by and had s*x with him.
They were spotted together by police officers on a routine patrol.
At Dumfries Sheriff Court yesterday, Dawson admitted that on December 21, while she was in a position of trust, she engaged in s*xual activities with, or directed towards, a person under the age of 18, and that she had s*xual intercourse with him.
Procurator fiscal depute Lyndsay Hunter said that Dawson had met the youth in Dumfries and then drove him to a lay-by on the Cummertrees to Hoddam Road.
She said that at around 5.20pm, police noticed the car, which had condensation on its windows.
The fiscal added: ‘The officers remained in their vehicle and spotted the couple in the passenger seat of the car.
‘They left their vehicle and approached the parked car where they saw the couple having s*xual intercourse.
‘The police officers knocked on the car door and then saw the accused and a male, both unclad from the waist down.’
Mrs Hunter said that Dawson was spoken to and it became clear that she was a teacher.
Sheriff George Jamieson deferred sentence until May 1 and called for reports, including a psychiatric assessment.
Dawson, of Dumfries, who taught at the town’s St Joseph’s College, was placed on the s*x offenders’ register.
Sheriff Jamieson said the length of time she would remain on the register would be decided when she was sentenced. Bail was continued.
Solicitor David Finnie, defending, told the court that he would reserve his plea in mitigation until reports were prepared.
When Dawson was originally charged in January, one former pupil said that she often sent text messages signed off with kisses and claimed that she was known for being ‘touchy-feely’.
Yesterday, a spokesman for Dumfries and Galloway Council said Dawson was no longer employed by the authority and it would therefore not be appropriate to comment on the case.
Last night, there was no answer at the house that Dawson had shared with her husband Ranald, 32 – the son of the former Solicitor General for Scotland, Lord Dawson.
The teenager’s family could not be contacted for comment last night but when details of the case originally emerged, a woman at the family home said: ‘He is the victim in this but I don’t want to talk about it.’
A spokesman for the General Teaching Council for Scotland said: ‘We are aware of this case and conducting our own investigations into this matter.’
Source: Dailymail