His father would skin him alive if he ever found out his son was at a brothel - Not to mention that the same son was sneaking around Hermione's desk at odd hours after second and third shift at the Ministry. Draco found it was the best time to steal stray hairs off of her desk to brew a poly juice potion for the prostitute he rented for an hour once a month. He felt it would be the closest thing he would ever have to Hermione shivering and quaking at his touch, so he continued to do it.