Rin saw Sajuna and Shinju out of the hotel, but he didn't leave. He ordered the room cleaned immediately... there was another guest arriving.
He didn't wait long in the living room before Sakiko Toyokawa, wearing her grey uniform and green plaid skirt, appeared at the entrance. The moment she stepped into the room, she covered her nose with her knuckles, looking thoroughly disgusted.
"Ugh... what is that smell? Why are you here?"
"I'm here to discuss something with you." Rin paused. "The room was just cleaned; the scent of the disinfectant hasn't dissipated yet. Just wait a minute."
Disinfectant?
What kind of activities require a deep clean like that?
Though suspicious, Sakiko didn't pry. This was Karen's permanent room... Sakiko could guess what it was used for with a single thought.
As for why Sakiko was here... Rin hadn't called her for a party; he was letting her live here temporarily.
Though Sakiko had decided to stop running, she hadn't returned to the main Toyokawa manor yet. Teiji Toyokawa wanted her to wait until he finished clearing out the internal family drama. In the meantime, Sakiko was focusing on Ave Mujica.
Her old home... if she stayed there, she felt she'd have no energy to compose. So she moved into the hotel... it was more convenient for "stress relief" as well.
Hanging up her bag, Sakiko sat beside Rin. Her amber eyes were full of suspicion... Discuss something? He probably just wants a reason to eat me!
"What business?"
Sakiko looked at Rin with the wariness one might show a known pervert. While she didn't hate the idea of being eaten—in fact, she was somewhat looking forward to it—she wanted him to just be direct about it.
"It's about Hatsune... have you told her you know her real name?"
"Eh? Hatsune? N-no, not yet."
Hearing the name 'Hatsune' made Sakiko freeze for a second before she realized Rin was referring to 'Uika'.
"Mmm..." Rin pondered before speaking. "Actually, Hatsune was the first person I invited to the band."
"!?" Sakiko's heart skipped a beat. She quickly connected the dots. "Does Karen want to become 'best friends' with Hatsune too?"
Sakiko instinctively wanted to say "have a party," but such crude language wasn't her style.
"Not necessarily. On the day Karen decided to form a band, we were at the auditions with a friend. Hatsune happened to be a judge... After deciding to scout her, Karen did a bit of digging and discovered your connection."
Rin's logic was sound, but Sakiko had one more question.
"Why did you and Mutsumi keep it from me?" Sakiko paused to clarify. "Not the name 'Hatsune,' but why didn't you tell me from the start that she was already in? And when I invited her, she never mentioned you'd already asked her."
To Sakiko, Hatsune being in the band was a trivial detail. Yet Rin, Mutsumi, and even Hatsune herself had kept it a secret.
That's bizarre!
"It was Hatsune's own request."
Rin handed his phone to Sakiko. And then...
"MMMPH!!!"
Sakiko instinctively clamped her hand over her mouth. The video on the screen made her heart stop. A familiar voice echoed from the speakers.
"Mmm... Sakiko... Sakiko... Sakiko...!!!!"
"Is... is that Hatsune!? And she's holding... are those my panties!?"
Watching the screen as Hatsune pressed the underwear to her face, huffing them with "lung-filling" intensity while rubbing herself, Sakiko didn't know how to react.
"Th... that's why you... took my panties that night!? Wait... was Mutsumi there for that too?"
"Mmh." Rin nodded. "I used them to wipe up a bit and then gave them to her. Even drenched in my fluids, she huffed them with everything she had. She even stuffed them in her mouth to lick them clean."
"...Her." Sakiko let out a helpless sigh. "Why did she become like this?"
"Sexual repression."
"...?"
"She told me a bit about it." Rin combined his memories to summarize the sisters' backstory for Sakiko. "Forbidden from seeing you as a child, she was 'healed' by you and fell in love."
"Then there's her personality. Her foster father treated her well—no, too well. He never scolded her, even when she messed up. This made her feel like an outsider, creating a barrier between her, her father, and her sister. She fantasized about being disciplined like a 'real' daughter."
"The reality was the opposite. To satisfy her needs, she constanty fantasized about being a tragic heroine... and reality actually is a tragedy for her."
"Lesbian feelings are already a 'deviant' path in her mind, and then there's the fact that she's your biological aunt. On top of that, she stole her sister's name and identity. She's been crushing her emotions under a mountain of guilt."
"That's the summary... the weight of it all led to extreme repression. And the result of that repression is huffing your panties with 'lung-filling' intensity."
"So it was her..." Sakiko's lips trembled. But she quickly noticed an inconsistency. "Wait. Didn't you say you took the panties that night because of Mutsumi?"
Sakiko was sharp, but Rin was prepared.
"The part about her repression was my deduction based on her history. I didn't plan on interfering... but I happened to have your panties on me that night, so I decided to test her. The video you see is the result."
Sakiko nodded. That made sense.
"Hatsune... is her mind okay?"
The old Sakiko would have been judgmental. But after seeing Mutsumi's condition and now this video... she genuinely feared for Hatsune's sanity.
Sakiko leaned back against the sofa, her eyes full of weariness... Two members of my band are mentally ill, and it's all because of me.
"What... what should I do?"
A helpless Sakiko looked to Rin for guidance. Her mother was gone, her father was a drunk; she couldn't talk to her grandfather about this. Rin was her only lifeline.
"Her mental state is actually fine. She's been repressed for so long that if she was going to break, she would have years ago."
Hearing this, Sakiko let out a breath of relief. But it didn't last.
"Her sanity is fine. Her fetishes, however, are a problem... After I gave her those panties, I think I awakened something dangerous in her."
"What kind of interest?"
"A Cuckold fetish."
"...?"