Draco always Obliviated him or modified his memory after most visits. Whether they had agreed to this method beforehand in some sort of contract or not was unknown to Pansy but she had her doubts. Either the Healer had no qualms to his easy wealth, or Draco had Imperiused him, or he truly did not know the insidious conditions under which he was employed. Draco had only told her how to take action in case he was needed and that was that. The rest, she had learned later in bits and pieces.