NEW PORT RICHEY — A Pasco County substitute teacher was arrested Monday and charged with having a sexual relationship with an underage male student at Mitchell High School.

Lisa Robyn Marinelli, 40, of 9824 Nicklaus Drive, New Port Richey, had been under investigation by the Pasco Sheriff's Office since late February, after the victim's father reported seeing his son get out of Marinelli's car while pulling up his pants, sheriff's office spokesman Kevin Doll said.

During the course of the investigation, the father turned over records of hundreds of cell phone calls and text messages between the boy, whose name is not being released, and Marinelli. Thirty-five text messages remained in the boy's phone, including one asking, "How about a quickie 2morrow afternoon?" and another inviting the boy to Marinelli's home "because real men only need 20 minutes."

Doll said the boy showed deputies that he had a pair of Marinelli's underwear, which she gave to him as a memento of their sexual relationship.

More in tomorrow's St. Petersburg Times and on tampabay.com. (Photo from Pasco County Sheriff's Office)