[x] They turned into animal form to sniff them out.
Without hesitation, Mira had already morphed into a wolf and leapt up and out of the window in a single bound. Satsuki rushed over and, minding the broken glass, peered down to see the silvery lupine Mira already awaiting her.
Satsuki first had other inclinations, like to barricade her door should her mother come in and see that her daughter nowhere in sight. Yet she then thought that blocking the door would cause its own problems, as if a mother not being able to enter her daughter's room wouldn't raise eyebrows.
As Mira began to bark, Satsuki sighed and went with just winging it, in more ways than one. It's not like Mum checks my room that often, if I'm quick she won't even know I'm gone, Satsuki thought, as she for the second time morphed bat. She just had not to morph back anywhere near her window, that was all.
Being furry enough as a bat to withstand the night air sure helped, but as she looked down at Mira a whole new problem raised its head: How would the two even talk to each other without humanoid, or even the same species', vocal cords?
For now, Mira communicated by barking towards the slope beneath the Yumenos' stilt home. Satsuki flapped on down to also investigate the area, trying to squeak out sonar waves to find anyone hiding out down there, just like bats were supposed to. Most of what pinged back at her felt like a bunch of rocks and dust, no human heartbeat or the like.
Mira rushed back out from beneath and shook her head, before she tried standing on her hind legs and barking upwards, like she was asking Satsuki to fly up higher. Satsuki in return squeaked back at her, trying to communicate that Mira shouldn't make so much noise or Mum would hear. Yet none of that seemed to get through to Mira, who just kept pointing one paw upwards.
Satsuki groaned, as much as a bat could do anyway, and then flew up high while Mira kept sniffing around on the ground. The good news was there was no wind that night, so she was secure in that she wouldn't be blown around. The bad was that, vampire bats being microbats, being this high up failed to give her an advantage in seeing anything. At least she now had echolocation... only for her to sigh when she remembered that skill was most useful for navigating tight spaces like caves (or underwater if you were somehow a dolphin), not the open air.
She was able to ping at least one human, but she had no way of telling if it was her mother, Goichi, an Archimedea agent, or someone else entirely. Satsuki then took the risk of landing on her roof and then changing back, hoping her 'human' eyesight would let her make out this mystery figure.
But then there was the matter of even landing on her roof in the first place, since as a bat her overriding instinct was to find something to hang upside-down from, hence her crash in the courtyard earlier. Another bark from Mira signalled for her to come back anyway, or as far as Satsuki could even tell anyway.
Mira leapt right back up into Satsuki's room, even if this time she had to scramble up the side of her house a bit to do so. Satsuki flew in after her, making dead sure not to try transforming back until she was more than indoors. Her luck paid off as she morphed back to human right on top of her bed, even if doing so caused an almighty squeak to erupt from it.
Mira naturally morphed back more effortlessly, and then said, "As I was trying to tell you, I may have tracked down exactly who sent that blood bag!"
Before Satsuki could ask who though, the door flung open as her mother stepped in. Good thing the angle at which said door opened obscured her desk, hence the blood bag, from sight.
"Good, you're both still here," Hifumi said, making her daughter sigh internally with relief. "I heard what sounded like a wolf howl coming from nearby, or some unusually loud dog bark anyway."
Mira cut in with an explanation before Satsuki got any chance. "A wolf howl? Why, Mrs. Yumeno, you must be hearing things! There've been no werewolves in Hayagawa since the vampires chased them out aeons ago," she laughed.
Hifumi rolled her eyes at that. "How droll," she muttered, "Anyway, isn't it time for your new friend to get going? Night's not getting any younger."
Well, least she's changing the conversation, Satsuki thought.
"Ah, I was just preparing to go," Mira said, "But a few more words with your daughter first, if I may?"
"...Fine, but be down in ten," Hifumi said before she left the two.
Satsuki's mother no longer in earshot, Mira then said, "Like I was about to say, I could only pick up Goichi's scent nearby. Not that he particularly smelled of anything, but regardless."
"Hold on, that doesn't prove it was him," Satsuki said.
"Why yes it does, by process of elimination," Mira said, "If not him, who else?"
"My Mum, going by your logic. While we were up here she couldn't have gone out, thrown the bag in, and you wouldn't have picked up her scent since it's all around the house," Satsuki went over. "Not saying it is my Mum, just that we couldn't rule her out by your logic.
Or Hell, what if it's Archimedea, and they know to mask their scent in preparation for stuff like this?" she kept on going, "Or- or Ichiya. Goichi knows him, he'd have access to blood bags, and could hide his scent being a medical trainee."
"...Satsuki, are you honestly trying to complicate things?" Mira asked, hands at her hips.
"What? N-no, I'm just... trying to cover all bases, yeah," Satsuki said as she sweated. She then placed her bets on the culprit being:
[ ] Goichi.
[ ] Ichiya.
[ ] Her mother.
[ ] An Archimedea agent.
[ ] Not enough information to draw a conclusion. (Write-in)
[ ] Write-in