A Pennsylvania teacher has been charged with having an affair with a male student for almost a year, allegedly exchanging an alleged 509 phone calls with the 16-year-old and 319 text messages. Sarah O'Neill, 35, a former English teacher at all-boys private boarding school Church Farm School in Exton, was caught by a fellow staff member after leaving a love letter she wrote to the boy on the office printer. 'The thought that I could love so deeply and so wrongly pervaded before you and I even officially began,' O'Neill allegedly wrote the teen, according to NBC Philadelphia. 'It was quite a long winter break before my lips even attempted yours and I wondered if you were as affected as I.' Scroll down for video . Inappropriate: Sarah O'Neill, the former chair of the English department  at Church Farm School in Exton, Pennsylvania, has been charged with four counts of corruption of minors . Police say the pair had confessed their love to each other and were together 10 months. The relationship lasted even after O'Neill was asked to resign following the discovery of the letter. The teen, who is now 17, told police he began seeing O'Neill in January 2014. He said they first kissed at Motel 6 in King of Prussia in the February, and then again in March on O'Neill's birthday. The boy claims the pair also enacted in oral sex on several occasions at the hotel, in O'Neill's car and at a park. A custodian told police she caught O'Neill and the boy in a locked classroom with the lights off three times. Scene: Police say the pair had a 10-month relationship both on and off the Church Farm School campus . One time her stocking appeared ripped and another O'Neill said she was helping the boy with extra credit, the custodian said. On top of the hundreds of calls and texts, police say the two talked on the phone for a total of 106 hours and also exchanged emails. In one the teen asked O'Neill what she was wearing. She replied: 'I should be wearing sexy clothing for you when you ask that. Like some tight underwear or nothing. But I am too formal for such outlandishness.' The teen then went missing from campus in November, and it became clear he was O'Neill. Caught: The school filed a report with police after catching O'Neill with the student . Charged: Police say the affair in started in January 2014 and that O'Neill was asked to resign in September, but the pair were still seeing each other in November . He told police they were at the Extended Stay America in Exton having oral sex. He returned to the campus after several phone calls from the $35,000 a year boarding school. Church Farm School told NBC Philadelphia that O'Neill was employed from September 2007 to June 2014. She was arrested following an investigation. O'Neill has been charged with four counts of corruption of minors. She is currently out on bond and scheduled for a preliminary hearing on February 2.
Sarah O'Neill, 35, was an English teacher at Church Farm School, an all-boys boarding school in Exton, Pennsylvania, for seven years .
Allegedly engaged in oral sex with a 16-year-old several times between January 2014 and November .
The two were intimate in hotels, her car and a park, police say .
Exchanged 509 calls, 319 texts and were on the phone 106 hours .
O'Neill has been charged with four counts of corruption of minors .
A Pennsylvania teacher has been charged with having an affair with a male student for almost a year, allegedly exchanging an alleged 509 phone calls with the 16-year-old and 319 text messages. Sarah O'Neill, 35, a former English teacher at all-boys private boarding school Church Farm School in Exton, was caught by a fellow staff member after leaving a love letter she wrote to the boy on the office printer. 'The thought that I could love so deeply and so wrongly pervaded before you and I even officially began,' O'Neill allegedly wrote the teen, according to NBC Philadelphia. 'It was quite a long winter break before my lips even attempted yours and I wondered if you were as affected as I.' Scroll down for video . Inappropriate: Sarah O'Neill, the former chair of the English department  at Church Farm School in Exton, Pennsylvania, has been charged with four counts of corruption of minors . Police say the pair had confessed their love to each other and were together 10 months. The relationship lasted even after O'Neill was asked to resign following the discovery of the letter. The teen, who is now 17, told police he began seeing O'Neill in January 2014. He said they first kissed at Motel 6 in King of Prussia in the February, and then again in March on O'Neill's birthday. The boy claims the pair also enacted in oral sex on several occasions at the hotel, in O'Neill's car and at a park. A custodian told police she caught O'Neill and the boy in a locked classroom with the lights off three times. Scene: Police say the pair had a 10-month relationship both on and off the Church Farm School campus . One time her stocking appeared ripped and another O'Neill said she was helping the boy with extra credit, the custodian said. On top of the hundreds of calls and texts, police say the two talked on the phone for a total of 106 hours and also exchanged emails. In one the teen asked O'Neill what she was wearing. She replied: 'I should be wearing sexy clothing for you when you ask that. Like some tight underwear or nothing. But I am too formal for such outlandishness.' The teen then went missing from campus in November, and it became clear he was O'Neill. Caught: The school filed a report with police after catching O'Neill with the student . Charged: Police say the affair in started in January 2014 and that O'Neill was asked to resign in September, but the pair were still seeing each other in November . He told police they were at the Extended Stay America in Exton having oral sex. He returned to the campus after several phone calls from the $35,000 a year boarding school. Church Farm School told NBC Philadelphia that O'Neill was employed from September 2007 to June 2014. She was arrested following an investigation. O'Neill has been charged with four counts of corruption of minors. She is currently out on bond and scheduled for a preliminary hearing on February 2.
A Pennsylvania teacher has been charged with calls with the 16-year-old and 319 text messages. Sarah O'Neill, 35, a former English teacher at all-boys private boarding school Church Farm Church Farm School in Exton, Pennsylvania, has been charged with four counts of corruption of enacted in oral sex on several occasions at the hotel, in O'Neill's car and at a park. A police say the two talked on the phone for a started in January 2014 and that O'Neill was following an investigation. O'Neill has