A substitute teacher has been charged with first-degree sexual assault after she allegedly had oral sex with a year-old student on her first day at the job. WUSA reports:. According to police, Symone Greene, who taught an English class at Options Public Charter School in Washington, D. Friday marked the first time that Greene had worked at the school and it will likely be her last, since the teen videotaped the encounter and reportedly showed teammates and friends the footage. The school told NBC Washington that Greene, 22, was hired as a substitute teacher through a Delaware-based contracting company. According to reports, the teen told officers that he flirted with the sub during class and that at some point the two exchanged numbers and then text messages.