Before giving her answer Sally sat down on the chair closest to her room while closing her eyes and thinking about her desired transformation... of swimming among the vast waters endlessly as a mermaid instead of a human.
"Sally... come on what-" Jason started before witnessing his daughter's clothes suddenly fading away leaving only a pair of orange bivalves shells tied with seaweed covering Sally's chest, Jason just collapsed into the opposite chair at the shock.
"Awesome... check out the start" Sally responded as she opened her eyes to see the start.
Just then Sally's legs were drawn and locked together, she giggled in joy as she felt her toes suddenly lengthen out with her nails being absorbed away by the process of toes becoming branches and a membrane then growing between them to finish of the tailfin.
next Sally gasped happily as her skin started merging her locked legs together into a single limb, her tail with her vagina moved slightly up front, finally sky-blue bumps started forming and spreading all b from her waist and downwards, finishing the process.
Sally was now a Mermaid
"well dad... what do you think?" Sally inquired over her transformation.
"I'd... say it's more the back and-" Jason started before changes started happening to the room like imnformed, Sally's side of the room sank down quite a few feet which Jason admitted justified somewhat them being in a second floor room but by his calculation being at least 5 floors high, the carpet was exchanged with sand and certain furniture by rock-sculpture counterparts but cushioned to retain comfort as Sally noticed, then out of nowhere Sally's side was flooded with water but Sally just accepted this and once submerged quickly felt the feeling of water passing through her body like air and her eyes actually being supported by the water as opposed to being harmed by it.
"Sally... SALLY" Jason called out in a panic, with Sally then swimming up and emerging moments later.
"What, like this I can breathe and see underwater perfectly and withstand serious pressure?" Sally questioned.
Just then Harriet returned "Well... someone jumped, or rather dived, right into it" she remarked. "you bet'ca" Sally agreed "now i'm going to see how to nap and/or sleep like this" she then said before starting to dive back down. "the shell should be ready then" Harriet responded.
"Shell? what shell?" Jason asked in confusion. " the giant clamshell now replacing Sally's bed... it's what mermaids sleep in" Harriet answered, from that Sally continued her dive and swan to her now underwater room and indeed found a giant sized clamshell where a bed had once been, one surprisingly easy to open and close and an inside very inviting and cosy.
"now then... you plan on eating in tonight or going to the restaurant, Sally's side at this point is now connected to the special tunnel system that allows aquatic formed guest to transverse the resort" Harriet then requested.
"umm... let's see first" Jason started: