28-year-old Katherine Harper is believed to have drunk alcohol and swapped nude selfies with the boy during the abuse.
The pupil is believed to have told police in Roanoke, Texas: “One thing led to another and she told me to ‘put it in’ and I did.”
She will be put on 10 years’ probation after leaving prison and must register as a sex offender for life.
She was said to have gone to his home in Trophy Club where they drank booze before stripping.
The young boy then performed oral sex on her, reports say.
She further abuses the boy at his or her home in Fort Worth from the start of June to the end of July 2016.
Investigators who seized the lad’s mobile phone said the two communicated with each other some 76 times.
The arrest warrant did not say if the pupil was the baby’s father.