Gunn is approached by old flame Trish, mother of pupil Ryan, who reminds him of a one night stand they had thirteen years ago. As a result Gunn wrongly believes that he is Ryan's father and, although the boy is useless at everything, praises him to the skies. After he has confided in Sarah the whole school knows his 'secret' so he goes public on the parents' evening. Trish has to disabuse him and bring him down to Earth with a bump.
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