Randi Zurenko, 33 and married, was arrested yesterday and suspended from the mixed private Catholic school.
The pupils have been identified only as “Victims 1 and 2” and their ages have not been revealed.
Zurenko is said to have hooked up in January 2013 with the first one, who graduated later the same year.
The pair went to a park where Zurenko massaged the girl’s back and undid her bra, said police.
In early 2015, Zurenko allegedly started a relationship with Victim 2, which continued until last Friday.
They are said to have had sex multiple times.
Zurenko, a mother of five including twins, took photos of some of the acts and of the pupil in various states of undress.