Thank you, Miss Granger; I have been aware Black's alleged sense of humour clashes quite firmly with my own preferences in being addressed for quite some time. I have given up hoping that he is capable of keeping an interaction cordial and professional by now, but that does not mean I must stoop to his level.

I regret to inform you this variant of the potion did not have the intended effect, meanwhile. Black and I are discussing the results and attempting to determine how to proceed.