Riku is so, so glad to have Aslan around. He might just have broken apart after the spoiler!log if he hadn't been there. He also would have probably died out in the darkness with nowhere to go. Aslan's been there to help Riku along when no one else has, when he's been too busy caring for other people and not having time for himself and his own feelings.

With him, he can be a little selfish. He can think about what's good for HIM instead of just for the group. And he's so, so grateful to have a father figure in the Port to keep him in line.