[there’s just a slightest laugh at that - even as he hums a pleased note under the attention. he presses his face into the pillow momentarily just because he wants to make his brother work a bit harder before he gets to know how his actions affect higekiri - ]

How close did... um, Zero get to the body? Was she further away during the investigation than the both of you?

[he sounds just a little bit more distracted - but he tries to keep up the thread of conversation]

That would have made.... four antidotes in the shop....?