AU. Based on the book Perfume the story of a murderer by Patrick Süskind. Benny is looking for his 'thirteenth scent' to add to his concoction of a perfume to make it perfect. The previous twelve scents have all belonged to women and Benny expects the thirteenth to be a woman as well. But his sense of smell brings him to meet Dean, the rich young son of John Winchester. So he finds work at the house as a manservant to Dean to get closer to him. Sam has warned Dean many times to be wary of Benny but Dean doesn't listen, he believes Benny is a good person. Benny comes to Dean's room one night drunk and beds him and he's intoxicated with Dean's scent. He suffocates Dean in the morning and extracts his scent finishing his perfume. It is perfect, the sweetest scent he's ever smelt. But he feels a sense of loss now that Dean is gone. Angst fest after that please.