He doesn't need any kind of TARDIS bells and whistles to detect rising sincerity levels, and he responds with the usual dismissive blustery huff. What did she think? That he'd fix the rift and then just show her the door without so much as a by your leave? When he has so much to make up for? The owl isn't making eye-contact with anything, trampling in the sand like a cat trying to get comfortable. "Of course you could! You've lived in the TARDIS ages and not even been to so much as the moon. Now that would be, that would be a disgrace." She's been bounced from one form of confinement to another all her life. The cage gets a little bigger, maybe big enough she doesn't even see the walls anymore, but she's still in it. What a perfect target for showing the sights. See the universe through new eyes? Well, these eyes are about as new as they get. How could he pass that up? It just wouldn't be fair, and he's been on a fairness roll, for once. The universe has been almost unnaturally just, in some regards. Would be a shame to spoil that streak. "Wouldn't you want to put off going back, for a bit?"