The victim is a class eight student and his family lives as a tenant in a house owned by the father of the accused, they said.
The woman allegedly forced the 14-year-old boy into having physical relationship with her, they said. The woman threatened to kill the boy if he did not meet her demand.
She also made a video and started blackmailing the boy, SHO Dharm Pal said, adding, this continued for several months.
Later, the victim told about the entire case to his father, who then approached the police. A case under various sections of the Protection of Children from Sexual Offences Act 2012 (POCSO) has been registered against the woman today, police said, adding, the accused was absconding.
The police have taken possession of the objectionable video and further investigation in the case is on.