Donovan, who met the teenager through his sister, had her first sexual encouter with him on Tuesday, law enforcement sources told SILive.com.
The wannabe Mrs. Robinson was reportedly outed when her underage conquest bragged to friends and the secret slipped out to his mother, who called the police.
Incriminating text messages between the pair confirmed the act, sources said.
Donovan's lawyer Mark Geiser dismissed the accusation as a "fabrication" and blamed the boy for inventing the story.
"He has a crush on her," Geiser told SILive. "He has a rich imagination, an overactive imagination."
A relationship between a 20-year-old woman and a 13-
Staten Island woman arrested after allegedly having sex with 13-year-old Watch video
Geisser also pointed to the the accuser's mother's own troubled legal past, citing her recent perjury indictment.
On top of the rape charge, Donovan faces charges of sexual misconduct and endangering the welfare of a child, according to a spokesman for the District Attorney's office.
If convicted, she could face up to four years in prison and would become a registered sex offender.
"She's a very nice girl. I'm very surprised to hear that," Donovan's neighbor Ron Hansen told CBS 2.
But Louis Diamond, who represents the teen and his mother, stressed that nice or not, Donovan knew what she was doing.
"This is a woman. She's not a girl," he told SILive. "Don't forget, there's a big difference between 13 and 21."
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