"... Hey." He reaches up to boop Seto on the nose gently. "I... I know the risks when I'm heading out on a mission. I know I can get hurt. But I... I have to protect the people I care about."

He can feel his eyes watering, but he has to make Seto understand. "You're worth protecting, Seto. To me, and to a lot of people." He coughs again, rolling to lean against his brother some more. "I... I'm scared of what'd happen if I lost you."