A former teacher accused of engaging in sex acts with multiple teenage boys now faces more charges ... his friends were ...

According to court documents, one of the victims, a middle school boy ... wear the mask from the movie "Scream." Fortinberry allegedly told the teens if they reported anything, she would kill herself.

WALNUT CREEK — A teen boy who attacked a schoolmate with a knife ... face and arm while wearing a “scream” mask and lying in wait at a secluded part of the campus, police said at the time.