Hot girls like Sammie has an easy journey to good grades. Even while not doing their homework and not showng up for class they can salvage their grades by fucking their male teachers!
It was a similar thing going on with Sammie. She was about to fail and had to go to a private meeting with her teacher. She used her time there good and managed to seduce him rather quickly. She sucked his penis and let him bang her in every position of his choice!