[ There's a self-satisfied smile at Nana's reaction. There is technically no reason to be satisfied because she sincerely hadn't meant her comment in a strictly dirty way, but it's not a reading she is displeased with either. ]

Oh, you did put thought into it!

[ This seems to become a reoccurring sentiment around Nana. ]

Her existence caused a lot of strife among archaeologists because her grandson had tried very hard to erase her from living memory. Too bad for him, he truly lost that battle.

[ She doesn't seem at all sorry for the guy.

Miach's own dancing also gives the sense that she dances a lot, though signs of any formal dance education are missing. She's taught herself, for fun, in the confines of her bedroom or random parks. ]