Kearney Day, 22, pleaded guilty to having an 'improper relationship' in 2014 The student, who was 16 at the time, said she considered Day her girlfriend They used chat app Kik to send sexually suggestive messages The student said they had sex 'multiple times' on Valentine's Day Day was given four years' probation, a $500 fine and community service http://i.***************/i/pix/2016/03/26/02/32908A5E00000578-0-image-a-83_1458958608925.jpg +3 Guilty: Kearney Day, now 22, pleaded guilty to a charge of having an improper relationship with a student, having engaged in a relationship with a 16-year-old girl while working at her school in 2014 A 22-year-old former teacher's aide in Allen, a suburb of Dallas, pleaded guilty this week to a second-degree felony charge of having an improper relationship with a 16-year-old female student in 2014. Kearney Day was 20 and working at Allen High School when she began a relationship with the unnamed student there. Ultimately, the student told police, they ended up having sex 'multiple times' while her parents were out on Valentine's Day. She also told authorities she considered Day to be her girlfriend, The Dallas Morning News reported. The allegations came to light in April 2014, when the girl told her principal about the relationship. Day was fired soon after, on April 4. The girl said that the relationship began in January that year, and that the two would communicate using the chat app Kik. One Kik message from Day later retrieved by police read 'Mm I want you,' the paper reported in 2014. Another read 'I’m about to lose my goddamn job over this... Keep your mouth shut about me. So much for being able to trust you to in the beginning idek [sic] if ill [sic] be able to talk to you in the hallway now cause someone’s spying on my [expletive].' The student also showed school officials an image of Day in her bed that she said was taken on a Valentine's Day sleepover. However, according to the 2014 affidavit, when initially questioned by police, 'She stated that if something sexual had taken place that she would not tell police about it because she would not "ruin Day’s life."' Day told police that she sent the Kik messages, but denied having sex with the student, saying she had only hugged the girl and given her a 'back rub.'