Subaru: [Those eyes are awfully filled with suspicion!]
Exasperated by such a lack of trust in himself coming from her, Subaru surreptitiously stuck his finger in his mouth. Then, he double checked the position of the package hooked to a molar.
Subaru: [――――]
What laid there, was the last resort that Subaru had requested Old Man Null to concoct.
He had seized this loop by overcoming a desperate challenge, and he absolutely did not want to accidentally ruin it with an inadvertent mistake. He had to be very careful not to die from careless mistakes.
――Thinking this, Subaru stuffed the wrapped “drug” behind his molar.
-Arc 7, chapter 67, "Hidden Behind the Molar"