A California high school teacher has been charged for allegedly having sex with a teenage boy.

Samantha Ciotta was charged after the underage boy told police that he used to get drunk with her and had sex with her multiple times over several months. He also said that he does not know how many times she had performed oral sex on him because he was often too drunk to remember.

Investigation into the case started in September after the 32-year-old was arrested when another student informed Child Protective Services (CPS) about the alleged relationship. The student had watched the teen's Snapchat story when he saw Ciotta allegedly come into view.

The Beaumont High School teacher was only wearing "a shirt and panties". He also allegedly asked the boy if the woman in the video was "Mrs Ciotta".

To which the teenager replied bragging about his alleged sex life, "Yes ... Bro, I'm getting' in deep ... been f***ing (Ciotta) and getting threesomes for the past couple weeks (at her house)."

However, it is not immediately clear that the alleged threesomes involved other students or adults. The court documents have mentioned only one underage male for now, the Daily Mail reported.

Earlier, the mother-of-two was only charged with unlawful sexual intercourse with a minor, and oral copulation with a person under the age of 18 and had been placed on administrative leave by the Beaumont Unified School District. But now as the teenage boy has opened up after learning Ciotta had said he had "ruined her life", more charges have followed.

The boy had initially tried "cover for Ciotta so she would not get in trouble". She has now been charged with one count of oral copulation with a minor and two counts of sexual intercourse. She is expected to appear in court on 27 December.

Local media reports stated that Ciotta started taking interest in the teenager, whose mother is dead and father is in jail, in 2015. She had even described herself as his "advocate", according to a relative of the boy.

She used to send emails to his relatives informing about his well-being and his relatives trusted her. But soon the boy began arriving home in expensive clothes and with new gadgets, which his relatives believe the teacher and her husband had bought him, the investigation revealed.