[There's evident surprise in his voice, because despite what he knows of Piter - which is very limited, admittedly - that's far from the first question he expects to hear out of Piter's mouth, especially in a situation like this.
He takes a moment to judge what might be an appropriate answer, given the circumstances.]
It doesn't belong to me.
[Although, that being said--]
Though I would like enough to be able to run some tests on it - a few milliliters at most. If that's alright.