Prosecutors contend the texts between Mays and his friends and classmates on August 12 detail a night of heavy drinking and the sexual abuse of the girl.
Some of the messages were between Mays and the alleged victim.
In one message she asks what happened "last night."
"And don't lie about anything. I need to know the truth. People keep asking. Idk (I don't know) what to say," the message said, according to Joann Gibb, a computer forensic investigator with the Ohio Bureau of Criminal Investigation, who read the messages to the court on Thursday.
Mays responded that "nothing happened last night," but he told her in the message she performed a sex act on him, Gibb testified.
In some of the messages from Mays, according to Gibb, he writes that he had sex with the girl. In others, he says the girl performed a sex act on him.
One message asked Mays: " Did u do it?"
He responded, according to Gibb: "No, lol. She could barely move."
Still another graphic message from Mays to a friend appeared to detail his anger over being accused of rape.
"I'm pissed all I got was a hand job, though. I should have raped since everyone thinks I did," the message said, according to Gibb.
The defense questioned the validity of the messages, with Mays' attorney asking computer forensic expert Gibb whether she could be absolutely sure the messages were from his client.
"I can't put a person behind a cell phone," she said.
In earlier testimony, teens who attended some of the booze-soaked parties testified the girl appeared to be drunk, stumbling and slurring words.
But on cross-examination some said she seemed to be able to walk and answer questions.
The trial, which is likely to stretch into the weekend, is moving quickly to accommodate the schedule of the judge. A verdict is expected by Sunday.