The national epidemic of teacher-student sex stories marches on unabated. Any given week is likely to include several stories, and some are more intriguing than others.

This week, the sexual proclivities and travails of two teachers are worthy of your valuable time.

In South Carolina, police arrested middle school choir teacher Elizabeth Marie Moss for allegedly sexually assaulting at least one 13-year-old student. The incident allegedly included oral sex by Moss on the boy.

Moss, 31, has been charged with criminal sexual conduct with a minor, reports area CBS affiliate WLTX.

She is the chorus director at Chestnut Oaks Middle School in Sumter, S.C. After she was arrested, school district officials placed the teacher on administrative leave.

The sexual dalliance took place in the spring of last year at Moss’s home.

More recently, in October, Moss also allegedly used a pencil, somehow, in an apparently unsuccessful attempt to arouse a 14-year-old student. More charges may be added concerning this incident.

Investigators say they have also found what they describe as inappropriate messages Moss sent to some students via Facebook.

Moss is married to another school district employee, according to the Daily Mail. She has three children, ages three, five and 12.

The choir teacher is currently out of jail on $150,000 bail.

Meanwhile, in Reading, Pa., middle school science teacher Jessica Saienni was arrested on Friday on charges of sexually abusing a 14-year-old student, reports Philly.com.

Saienni, 30, taught science at Southwest Middle School during the summer of 2012.

Police say she called and texted the student after a field trip to Dorney Park & Wildwater Kingdom, a local amusement park. She got his cell number from a parental permission slip for the trip, notes the Daily Mail.

Saienni and the student agreed to meet on a special day in June. It was the boy’s 14th birthday. They cleaned her classroom together and ate some birthday cake purchased by the teacher.

By the third meeting, the two had sex — in Saienni’s vehicle not far from the Body Zone Sports and Wellness Complex.

There were also the requisite sexting sessions before the encounter.

The unidentified boy provided a description of Saienni’s home and an elaborate description of the tattoos on her lower back and thigh. These descriptions will likely be part of the case against the middle school teacher.

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