He couldn't help it. He hadn't even told her yet, but he was so relieved that she was still touching him that he covered her hand with his and held on.
"I...Padma, I'm..." Looking down at her soft, dark skin, he imagined that in about two seconds, she'd be pulling it away, staring at him with disgust and betrayal, and he realized that even though he'd come here tonight knowing that he had to tell her this, he hadn't actually taken the time to stop and think about how to do it.
She had asked him to just come out with it, and he didn't think there was any possible way to soften the blow, so he decided to give her this one thing she asked for, and so he spoke in a quiet rush.
"Padma, I'm not who you think I am. I came to live with Sirius because I ran away from my previous life. I lived in the woods. With...with a pack of werewolves. Because...Padma, I'm one of them." He looked up, meeting her eyes with fear and reluctance, his heart pounding. "Padma, I'm a werewolf."