Snake's eyes snapped up at the use of his real name. His face obviously showed that he was surprised someone finally used it, but as he had speculated earlier, he really wasn't Snake at the moment.

As for what Otacon had just said...
He let it sink in. "I am afraid. Maybe I'm making all the other stuff up, and I'm really just covering for how scared I am. I think...I think I need to talk to Samus when I'm not like this anymore."
He paused for a moment, considering his next move, and scooted closer to Otacon, letting his adolescence take over, and leaning his head on his friend.
"Thanks. This has been on my mind."