Ace paused for a moment and let the silence sink in, then started to chuckle and then turned into laughter. She then turned around and faced David with an intense, cold look in her eyes that showed the intent of murder. "I pity no one..." She replied, her words and voice were sharper and more painful than the cold kiss of steel. She meant it, too. Ace pitied no one but she cared for everyone, especially the ones closest to her. 
"Let's get one thing straight. It's okay to be afraid. It's okay to be pitied. And any pity or concern given to you by the ones who care about you is not wasted. I don't know what makes you feel 'happy' and at the moment I don't care. What I care about right now is that you understand that the kindness I have to offer you is because I actually give a damn about you. And that you shall receive no pity from me." 
Though she gives the appearance of a child; the look in her eyes would at the very least startle someone. Though she had no real intention to harm David, she had to make sure that he understood.