Avada Kedavra
He held her in his arms. Her blood gently dripped off of his body. His clothes were covered in it. He was soaked in the blood of an angel. He knew she was in pain. It was killing him that he could not have killed her differently. Anything was better than watching her suffer. She looked up at him. Her eyes were not angry or hurt like they should have been. Her eyes were sad. Those eyes would haunt him forever. He did not expect her to speak. Her final words made him truly regret his choice. She whispered "I'm sorry I couldn't save you. I still love you." Her words made him feel dirty and undeserving. She had loved him until death, literally.
A voice to his left hissed "Finish it." The man was clearly disgusted by her display of emotion. He pierced the heart that was still beating for him with the knife that he had used to torture her moments before.
His father actually smiled. The man was a sick bastard. That much was quite obvious. Draco knew what he had done was stupid. He looked at the love of his life and was hit with a wave of memories. Their first kiss, angry fights, amazing conversations, and many others attacked his already weakened mind. Draco felt nauseous. He looked at Hermione one more time and knew that he could not fix this. Draco knew he had ruined his life when he had killed her. He turned to his father and said "Good-bye." He then turned his wand to himself and whispered two fatal words. He would be with her, even if it was only in death. He still loved her too.