Mercy, Love And Other Useless Things

About an 18 year old women who has been an assassin all her life and makes most of her kills by pretending to fall in love with her target and then kills them just when they fall in love with her. Needless to say, all her victims are male and 18 years old or older, but when her next victim is an assassin with the exact same tactic., and her as the target... Things go horribly wrong.