Pira — Piers Anthony

Pira, short for Piranha, is the most dangerous girl in the world. She is phenomenally coordinated and has been trained to use crossed lasers that can incinerate objects at up to 100 feet, or instantly maim or kill people. When there are dangerous hostage situations, she is on call to handle them, and she can do it, efficiently. She must travel with a guardian, Orion, on whom she has a persistent crush. He's a nice guy and no slouch, a skilled martial artist with a black belt in judo, but really the junior partner here. How can he handle a girl with a devastating weapon who is not at all shy about her desire to get him into bed naked? Even her mother is sure he will succumb. He tries to hold out, but is slowly falling in love with her. Meanwhile the work is challenging as Orion has to advise Pira when and how to use her deadly power without revealing it to the world, and see that she completes her school education.