Teacher gives failing pupil 98% after having sex with him

25-year-old Kellyville high school teacher, Kalyn Thompson, in Oklahoma allegedly gave failing student a 98% result in his English test after they started having sex.

Cops claim the duo started talking outside class in December and had their first sexual encounter in March, shortly after the student turned 18.

They then engaged in sexual intercourse at least twice - once at a nearby lake and a second time at a hotel in Tulsa, investigators believe.

She is also said to have told officials that she had been sending inappropriate text messages to the boy.

Thompson was charged with second-degree rape and was held at Creek County Jail before being bailed out on $35,000 bond.

Despite the Oklahoma age of consent being 16, state laws rule that a teacher cannot have a sexual relationship with a current or former student until they are 21, KJRH reports.

Parents said they were "shocked" to hear the news of the arrest.

"You send your kids to small town schools thinking they're going to get a better education because there's more one on one," Michael Sullivan told KJRH.

"You don't expect to hear about a teacher messing with a student," he added.