The two face murder charges after Thandeka Moganetsi, 15, and Chwayita Rathazayo, 16, were found dead in a field in Dobsonville last week.
The boys appeared in camera on Monday, as they are both minors. The matter was postponed for further investigations.
The girls were dressed in George Khosa Secondary School uniforms and had cuts on their hands and necks.
Three black candles and two new razor blades were found at the scene.