If Draco was surprised to find her in his flat when he returned hours after she did from whatever mysterious mission he was on, he didn't say so. Neither one of them were brave enough to actually put their concerns and fears into words. Perhaps by giving voice to their worries, they believed they would bring them to life. It was an immature method to handle the situation. Death Eaters were emotionally stunted thanks to the path they'd chosen to travel down. Hermione wasn't sure it was ever possible for any in their ranks to have meaningful, fulfilling relationships with anyone.