First, Do No Harm

Primum non nocere - first, do not harm. The one abiding rule of medicine. Ironic seeing as Draco Malfoy has done more harm than most in his short life. Ironic seeing as Draco Malfoy is now subject to that one cardinal rule of muggle medicine after having harboured such loathing for the non-magical in his youth. Ironic that she, who he harmed the most, is now under his care.