According to police, the teenager had been allegedly showing obscene video clippings to the victim since last three weeks and 'sexually assaulted' him recently.
A case under various sections of Indian Penal Code and the Protection of Children from Sexual Offences Act (POCSO) 2012 was registered against the teenager at Virar police station yesterday, said Assistant Police Inspector NB Done.
The accused had also threatened the boy with dire consequences if he disclosed the incident to anyone, police said, adding the accused has been identified and further investigations are on.