A 52-year-old social worker and life coach has pleaded guilty to the grooming, sexual assault and penetration of a 15-year-old boy, who was bombarded with almost 15,000 text messages over a 10-week period in 2018.

When Morena Milani was arrested, police also uncovered a plan to hide her offending by falsely accusing the teenager of sexual assault, including fabricated photographs of injuries to her breasts.

Morena Milani outside the County Court on Tuesday. Credit:Jason South

Milani spent her first night in prison after admitting in the County Court on Tuesday she had aggressively pursued the teenager after initially making contact in March last year on the pretext she was concerned about his mental health.

Within months, Milani, who is married with two children, was taking the teenager to bars in Collingwood and Balaclava, buying him gifts and planning weekend getaways.