She had every right to be goddamn protective thank you very much. This was their little girl, no matter what anyone else said. They raised her alongside Setsuna, helped her grow. And no matter what form Hotaru was in, she was going to get her, hold her, and keep her safe- and the universe safe.
She didn't even talk, too focused. She stopped only to check her mirror before looking over the edge, It was... well the ocean. The fuku would be cumbersome and the the heels made things harder so she dropped her transformation and dived down into the water. When she came up she let out a noise of 'ohfuckcold' before swimming into the cave. "Hime-cbaaan! Hotaaaruuu." She floated in closer, taking in a gulp up very mucky water and shuddered until she saw a tiny ledge and moved to try and see. "Hime-chan?"