[On one hand, letting her carry him might be useful for manipulation later on. She'll continue to think of him as pathetic and in need of protection.

On the other hand, he's not supposed to be thinking about things that way and also he hates being babied.]

No, I've got it! See? [He hops once and visibly flinches.] I've... okay, fine, sure. [In the end, his physical discomfort wins out.] Guess I'll just hop on!

[Fortunately, Flowey is smaller and lighter than the usual Sunkern. He most likely is able to get on Lusamine's back with minimal discomfort for her.] Thanks for the ride! So... what's your story, anyway? You must've had an interesting life before coming here, huh?