Derek's expression turned thoughtful, his brow furrowing a little, but then he shrugged. "I'm worried about your well-being," he admitted. "Emotional and physical. But the rest?" He shook his head. "I'm used to being responsible for other people," he added, his tone wry, and he nudged her should again lightly. "If I can keep you and Stiles safe, I think I can manage a child."