Flynn's knock was perfectly polite, though it still appeared to startle the other man. Will's head came up quickly and he blinked his eyes a couple of times in rapid succession as he chased away whatever cobwebs had wrapped themselves around his mind.

His head?

Oh! Right.

"It aches," he admitted, setting down his writing utensil and motioning for Flynn to walk on through the doorway. "But no more than I'm used to dealing with."

He gave a small nod towards the mug on the desk, suggesting he had Willow Bark tea within.

"Did you need something?" The question probably comes out a bit more blunt than intended, just because Will is Will. But his bemused expression may soften it a bit, as he appears genuinely curious.