On Rose's hands, Steve's grip was tight. He'd never have known it, but this was where his fear was manifesting for the moment. Feeling Rose in the flesh had calmed him down considerably since reading her journal entry. She'd scared him to the core, but he was finally breathing steadily again.
Steve's eyes were constantly moving. When Rose moved her hair, Steve's eyes were watching. He caught the darkness around her eye, and he also caught her movement to cover it again. Though he frowned, Steve said nothing. If Rose wasn't ready to talk about it, he wasn't going to push her. She might be self-conscious about it. It wasn't like she was hiding anything from him; she'd told him about the incident. Steve brought his hand up to cup Rose's cheeks. "Of course I'll stay," he said quietly. "Whatever you want - whatever you need." It was Steve's time to support Rose in her pain, and he wasn't about to fall short on that responsibility.
Besides, Rose was more important than his hidden fear of Diagon Alley.