LANSDALE, Pa. – A math teacher at a suburban Philadelphia high school who’s accused of having sex with one of her students and sending sexually explicit messages to another has been ordered to stand trial.

Heather Lynne Zeo has been suspended from her job at North Penn High School in Lansdale. Both of the students are 17-year-old boys.

A Montgomery County prosecutor said at Wednesday’s hearing for the 36-year-old teacher that Zeo engaged in a “calculated seduction.” Defense lawyer Marc Neff says the boys were the aggressors.

Zeo is charged with endangering the welfare of a child and four counts of corruption of minors.