Just to introduce herself for now, and no.

"Unhand me Miia! I shall drive out this intruder! Have at thee!" Cerea shouted, throwing Miia off, and galloping right at an amused looking Ria. She swung a fist at the Erokami, but passed right through. Her body soon followed her fist as her momentum carried her forward... Right to the edge of the pool.

Flailing, she tried to stop in time, but was unable to, her front half going over the edge. "Papi will save you!" Papi shouted, flapping up and grabbing Cerea's tail with her harpy feet... Except the weight difference was way too much for Papi to be much help in preventing Cerea from losing the battle with gravity. Long story short? They both went into the drink. SPlOOOSH!!!

"... pffht! Hahahaha! So amusing to watch suckers make fools of themselves trying to attack a sex goddess! And I got another two for one special! There ought to be a prize for that!" Ria cackled as Papi and Cerea's heads broke the surface of the water, Cerea glaring at Ria with disdain, and Papi just looking cutely confused.

"What sorcery was that!?" Cerea demanded, pointing at Ria.

"Like I said honey, I'm an Erokami, a Sex Goddess responsible for your Master having the Sex Note in the first place," Ria grinned, leaning forward as she floated up to Cerea and poked her forehead. "Intangibility is just one of many powers we possess..."

"Cease this mockery!" Cerea griped, swiping at Ria's poking arm, but once again, her hand only went through. Ria sniggered as she floated back.

"And it's oh so very useful for making opponents look like total buffoons... Total shame Tobi was a bad guy in that ninja world I went to, he and I would have gotten along great on that one topic..." she casually mused. "He did the whole trolling with intangibility thing like a pro!"

"...ninja world?" Kimihito sweat dropped.

"Oh, right, you guys are all part of a collective of multiverses," Ria replied casually. "Travelling them is a simple matter for Erokami... I like to drop my Note into all kinds of places, and see what happens. In this case, a world full of cute monster girls?" she cooed. "How could I resist?"

"...fair enough, I guess... But why show yourself now?"

"I like to let the ones who get my Note have a little time with it before I come along, see how they do things, and whatnot. Normally, I would have waited longer, but the prospect of my usual schtick of scaring the newbie with the added element of a pool was just too good to pass up," she sniggered. "Don't take it personally, I mess with everyone who gets my Note at some point or another. You'll get used to it... They always do..." she pouted at that, apparently not liking the fact that her surprise factor always eventually wore off.

"...right..." Kimihito sweat dropped. "...so... What now?"

"Oh, nothing for the moment, just wanted to pop in and say hi this time! And scare the living daylights out of you, but hey, immortal beings gotta make their own fun, right?" she stuck her tongue out playfully. "I'll want to talk to you later some more about the kinds of fun we can have together, so for now... Toodles!" She then floated back up through the ceiling.

"...well that was... Something," Kimihito remarked, and also pausing as he realized he was going to have to tell Mero about the Sex Note earlier than planned to give her context for this whole set of shenanigans, before turning to the group... And sweat dropping as, speaking of shenanigans, he saw Miia holding Cerea's wrists and pulling, and Mero and Papi still in the water, pushing her rump, trying to help her out of the pool.

"Put thy backs into it!" Cerea was shouting, trying to get her forelegs on the edge.

"I'm trying!" Miia strained... Before her tail slithered over the floor where splashed water was, resulting in it slipping out from under her. "...crap..." Miia whined as she was pulled forward. SPLOOOSH!!!

...

Ria paused as she floated away and looked back. "...I left too early and missed something hilarious, didn't I?"

...

As Miia laid on the edge of the pool, trying to warm back up, Kimihito deadpanned at the frustrated Cerea. "How am I going to get out of this pool!? That ladder is not suited for centaurs!" she complained.

"...you DO realize that there are steps over in the shallow end, right?" Kimihito asked, pointing.

"...oh," Cerea blushed in mortification. "...I think I'm just going to let myself drown now..." she slumped a bit in embarrassment.

"Oh just go over and climb out," Kimihito rolled his eyes, before turning to Mero.