Shannon Hathaway, 33 is said to have romped with the boy almost a dozen times before his mother walked in on them in his room.
Hathaway also reportedly told the 17-year-old lad’s sister she was in love with him, and would leave her wrestling coach Joe for him.
She turned herself in to cops on a charge of improper relationship between an educator and a student after a month-long probe by police and education bosses.
The counselor had been on leave from Haywood Junior High School, Texas, US. Since the investigation started after the students sister told officials about the alleged affair.
She said Hathaway spent a lot of time with her brother in 2016-17 school year. He was now 18 and had since dropped out of school.
The sister never saw inappropriate behaviour between the pair; apart from her holding her brother in the 2016-17 year, police files say.
The teen told investigators he had consensual sex two or three times with Hathaway; in her master bedroom at her home in killer while her husband was away.
His sister and her pal stayed overnight at the same time and slept in a guest room.