She bites her lip in uncertainty at taking such a liberty, but Caspian seems certain-sure and it's clear that if Aslan objected they'd not be in any doubt of it. Susan settles cautiously against the Lion's side and looks up at him.

(you were fearless once - take back your birthright)

"It's hard to believe, some, but I'll not waste the gift I've been given," she assures him - assures them, really. A sweet smile curves her lips, and she squeezes Caspian's hand. "And aye, I kennit. It's a great fortune to me."