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PLANO (CBSDFW.COM) – A new algebra teacher at Plano Senior High School was arrested for allegedly having sex with a 16-year-old student.

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Alaina Danielle Ferguson, 23, bought the teen alcohol and exchanged nude photos over the phone, according to the arrest affidavit.

And it all started with Snapchat, according to the arrest report.

“The way it happened is he wrote his Snapchat name on a test and turned it in,” said Plano Senior High Student, Andy Flores.

The arrest affidavit detailed multiple sexual encounters during a two-month period on park benches and in the student’s pickup truck.

The encounters usually included a game of beer pong, too.

It seems many students were aware of the relationship between the new algebra teacher and teen after he reportedly bragged about it.

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“I heard the kid was just talking about it to his friends and I guess a teacher or a student over heard it,” said Flores about the rumors that quickly spread around campus.

“She’s kind of good looking… so she’s attractive,” said Flores about the young math teacher.

Ferguson, who’s engaged, immediately received attention after she was hired, according to several students.

Another senior, Samuel Balderrama said the age of teachers the growing district keeps hiring may have something to do with the uptick in similar cases.

“It’s just more young teachers than older teachers,” he said.

Police said since several of the encounters happened in the apartment of the teacher’s fiancé, McKinney Police made the arrest and Ferguson resigned from her job in Plano.

Ferguson told the victim, according to the report that she knew it wasn’t the right thing to do but felt right at the time.

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She has posted a $100,000 bond and is out of jail.