"Oh, I am most certain that he did it. Yes, something more garish would usually be his style, but only if his main purpose was regarding the mark. In this case, the purpose is to drive me insane."
He rose up, arms full of boxes, and lay them upon the display. His need for order made him take the time to set them up properly, rather than dropping them half-hazardly. He remembered hearing a Muggleborn mutter the words obsessive compulsive once with regards to his habits, but he had simply countered that ordered habits bespoke an ordered mind.
"Thus far, it has not come off from any efforts. Furthermore, an acquaintance of mine suffers from the same thing. I could only conclude George snuck into my flat and did something to my bedsheets."
In his concentration on the boxes, Percy did not realize what sort of conclusions such a statement could imply with regards to him and his acquaintance.