Algebra Teacher Had Sex With Student, 16, Multiple Times After Pair Shared Sultry Snapchats: Cops

The student told police that he wrote his Snapchat user name at the top of a test while in Alaina Ferguson's class.

An ex-high school math teacher in Texas has been arrested and faces charges after she allegedly sexually assaulted one of her students and sent him nude photos on social media.

Alaina Ferguson had been an algebra teacher at Plano Senior High School for just two months when she quit in October. In that short time, the 23-year-old — who was engaged to be married — had sex with a 16-year-old pupil, according to court documents.

Watch: Teacher Charged With Child Sex Abuse After Being Impregnated by Student

Prosecutors allege the flirtation began after the victim wrote his Snapchat user name at the top of a test and the two allegedly exchanged nude photos.

Days later, Ferguson allegedly met the boy in a park, where they allegedly had sex on a bench.

Court documents obtained by WFAA state that one to two weeks later, the aleged victim and his friend visited the apartment Ferguson shared with her fiancé, where they reportedly played beer pong and ate pizza. While the friend walked a dog, Ferguson allegedly had sex with the boy again.

"Ms. Ferguson told [the student] that she knew it was not the right thing to do, but it felt right at the time, and that she was going to break it off with her fiancé because she didn't feel anything with him," court documents state.

Authorities allege Ferguson had sex with the boy on multiple subsequent occasions, the latest of which they say occurred November 4 in the back of the teen's truck.

Read: What a Difference a Week Makes! Pretty 'Sex Teacher' Looks Haggard After Week in Jail

Ferguson was booked into the Collin County Jail on November 30 on a charge of sexual assault. She was released December 1 after posting $100,000 bond.

Ferguson's wedding has reportedly been called off.

Watch: Teacher Accused of Having Sex With Student While Fiancé Was at Bachelor Party