An arrest affidavit obtained by 11 News reveals disturbing details about what a District 11 substitute teacher allegedly asked a student to do in a recorded phone conversation.

Documents say 73-year-old Lloyd Clark offered a 15-year-old boy as much as $5,000 to perform sexual acts. The first incident allegedly happened in a classroom at Wasson High School last Thursday. The student immediately contacted the school resource officer.

According to the arrest affidavit, detectives then set up a recorded phone conversation between the alleged victim and Clark. In the conversation, a detective says Clark reiterated the agreement he allegedly made with the student earlier that day.

A former Doherty student, Caitlin Krzywonski says she doesn't believe any of it. She says she had Mr. Clark, he sub they all called Gramps several times as a freshman at Doherty High School.

"Everybody loved him, if you had a sub you wanted Gramps," Caitlin said.

Caitlin believes it was all just a misunderstanding.

"I think even if he did say something in a conversation it was not meant to be taken seriously, that's not the kind of man he was," she said.

Clark was arrested Thursday afternoon at his Colorado Springs home. He posted a $10,000 bond and was released from the Criminal Justice Center early Friday morning.

He faces a felony charge of solicitation for child prostitution. Clark is expected to be advised of his charges in court on Wednesday.