Vanessa Tyson, one of the women who have accused Virginia Lt. Gov. Justin Fairfax of sexual assault, described her encounter with the lawmaker in detail in her first televised interview Monday.

In February, Tyson alleged Fairfax forced her to perform oral sex when the two went back to his Boston hotel room during the 2004 Democratic National Convention. Fairfax has denied he assaulted Tyson, saying the sexual encounter was consensual.

Tyson told CBS News in an interview airing Monday that Fairfax invited her back to his hotel room so he could pick up paperwork. She said Fairfax originally appeared “harmless.”

Fairfax began kissing her, she said, which “wasn’t unwelcome, per se.” Then she alleges the encounter took an ominous turn.

“We’re kissing lying down, and we’re kissing, like so our heads are level with each other and then it was like my neck didn’t work,” she said.

"And then, the next thing I know like my head is like literally in his crotch and I’m choking and gagging, and you know, I couldn’t say anything because I’m choking and gagging,” Tyson said as she held back tears.

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Tyson and another woman, Meredith Watson, went public with sexual assault allegations against Fairfax after he appeared likely to succeed Gov. Ralph Northam, who admitted to wearing blackface as a young man. Northam has refused to step down.

Tyson, a professor in California, said she wants Fairfax to resign and has called for the state legislature to hold a public hearing on hers and Watson’s allegations.

“I think the Virginia people, the voters of Virginia, have a right to know, you know, both my story and Meredith’s story,” she said.

She said she did not tell anyone of the alleged assault at the time because she was ashamed. Tyson told CBS News she was a survivor of incest, and she had told Fairfax of the past abuse despite recently meeting him.

“You felt comfortable enough sharing that with him even though you just met him?” CBS’ Gayle King asked.

“Here’s the thing, what I was doing at the rape crisis center was actually probably the biggest part of my life at that time,” Tyson said of her previous work.

"Do you feel he took advantage of you knowing your past?" King asked.

“In retrospect, yes,” Tyson responded.

King’s interview with Watson, who alleges Fairfax raped her when they were students at Duke University in 2000, is scheduled to air Tuesday morning.

“My accusers have not filed criminal charges and they have not sued me,” said Fairfax in a statement. “Instead, we see escalating media appearances and stated desire for a political process that is unprecedented in Virginia and could not be designed to get at the truth. Such a process would instead be a media circus used for partisan and political purposes.”