Rachel Ann Hicks, 36, is being held on suspicion of child molestation and rape; she allegedly met the boy in an X-Box live chat room, the 'Daily Mail' online quoted police officers in Maryland as saying.
The online relationship progressed to phone calls, texting, e-mails and sending sexually explicit images and movies between one another, the investigators said.
Hicks, from Lake Forest, California, told the boy she was 23 years old. She flew to Maryland and met him at his home where they had sex over the Thanksgiving holiday, they said.
Shortly after, the boy's family discovered "romantic" text messages on the boy's mobile and he confessed the truth.
She used a fake name when communicating with the boy, but police tracked her down and served a search warrant on her home in Orange County on Friday. She was arrested without incident, the police officers said.
All the evidence collected will be forward to Hanford County Sheriff's Office in Maryland for their investigation, said the police.
And, based on new information, investigators are seeking to identify a second possible victim, a California boy under the age of 18, the report said.