"So", Masumi says, looking Shuuichi - no, Subaru - up and down, "you're saying that my oldest brother is alive, and you know where he is. Am I getting this right?"
Wondering how he got in this situation, Shuuichi, wearing Subaru's face, nodded slowly. "Yes", he says, glaring down at the little girl smirking at him.
"Moreover", Masumi continues, "you're claiming that my other brother, Shuukichi, has known this entire time that he is alive. And he didn't tell me."
Haibara's smirk grows wider. She's clearly enjoying Shuuichi's predicament far too eagerly.
"Well", Shuuichi says, trying to plan for a way out of the situation, "I'm sure your brothers have a good reason to keep you out of the loop. Perhaps there is a real danger to your life if you know where your oldest brother is."
Masumi rolls her eyes. "Right. Out of the two of us, Chuu-nii is definitely the one who doesn't need protection from anything dangerous", she mutters sarcastically and shakes her head. "He doesn't even know how to defend himself! How did he get to know but I didn't?!"
Before Shuuichi can say anything else, Haibara butts in. "Maybe they think you're too young to understand the situation", she suggests unhelpfully. Whether this is a payback for Akemi or something else, Shuuichi does not know.
Haibara's words seem to short-circuit Masumi's brain. She simply blinks for a few times before she finds the words with which to continue.
"What do you mean, 'too young'?!" Masumi shouts in Japanese before changing to English. "'Too young', my arse! I'm a detective, dammit! I've dealt with who knows what kind of lowlifes! And they think I'm too young? That's a load of crap!"
"She curses a lot more in English", Haibara remarks, slurping her smoothie. "I wonder where she gets that."
Definitely not their mother, that much Shuuichi knows. She never cursed around her children. "No idea", Shuuichi says.
"That's it", Masumi says, pulling out her phone, "I'm calling Chuu-nii and having him explain everything! And if he doesn't, I'll make him find a way to get me to see Shuu-nii."
Following his little sister's retreating back with his gaze, Shuuichi wondered how long he could keep Masumi from figuring out the truth. Or, at the very least, how to keep her from trying to knock him out with the same martial arts he'd taught her.
"Well", Haibara says, finishing her smoothie, "this is going to be very entertaining."