A chuckle filled his chest, not terribly surprised. He didn't blame her, though. Why anyone would willingly want to stick around a place like that was beyond him.
James took a moment to rummage through the slightly chaotic, not entirely satisfied with its contents after years of being spoiled by both Remus and Lily's compulsive habit for keeping stocks as full as possible. Still, at least he found a jar of hellebore. Some people thought it was toxic, given how it was ingested to expel harmful potions, but it was brilliant for making a poultice so long as you had daisy root on hand. Which she didn't. So he leaned over to set the jar down on the bedside table, making a mental note to get some the next day.
For now he settled on pulling out a bit of gauze, a large bandage fabric scarp, and a basic cleaning potion, arranging them in a small pile next to the bag. Instead of pouring the potion over the wound, he picked up the gauze to saturate most of its center with the light blue liquid. It kept a wound from getting infected better than cleaning it than just putting on a dressing.
"It's cold," he mentioned, barely aware of the warning leaving his mouth, before pressing it against her side.
The moisture was enough that the slow removal of his fingers allowed the gauze to cling to her skin, letting his attention turn to the cloth. As it was, it was a bit too big. Wary of disturbing the waterproof charm by cutting the fabric with magic James placed the hem between his teeth and gave a yank, creating a small tear he used as a starter to pull the piece into two segments. After detecting the porous side with the slide of his thumb he cast a quick sticking charm. They'd picked up the practice after Remus had suggested using adhesive muggle bandages, which never seemed quite sticky enough to overcome the sheer amount of sweat a body could produce in a fight. He carefully covered the damp gauze, overlapping the two pieces. Light fingertips smoothed over the perimeter of the fabric. The total area covered by the bandage was still a few times larger than the wound itself, but that was fine.
"There, much better," he pronounced, a bit pleased with himself as he began returning things to her little black leather bag.