An expert in thirstology.
A certified thirstigater.
A person who provokes, instigates, or initiates thirst from the opposite sex but, at the precise point when it seems you must/will have your fill, blocks the quenching of said thirst by a diversion.
That damn H is such a thirst-trapper. She had this dress on, her body was looking nice and she came to my house.. I was just about to bust it wide open and then, somehow, the next thing I knew she was gone..