I been searching for years but no luck so far....

It was a 2 part story...

1st part was in school. And a girl with her friends get some boys to follow them into the woods or a park...can't quite remember. But she fights them and uses scissors to cut off there penises and balls. And she calls there penises "there tubes"

In the 2nd part it's set when she is older and she picks up a boy from a school and she castrated and takes his penis aswell.

For the life of me I can't remember the name and it's driving me insane! For some reason the name in my head keeps popping up is Lisa. But Iv searched high and low and nothing I find is it