Professor Lily Potter, Slut of Hogwarts

[Guest Indubitably]

Essentially Lily survived, became a professor and just really loves sex. She uses it to motivate/reward her students. Also really likes group/gangbangs. 

1) Maybe she's a potions teacher and uses it to enhance her students performance. 

2) Maybe she's a magical creatures teacher and shows hands on their mating habits. 

3) Or maybe she teaches transfiguration and uses it on her students