It wasn't so much that Kurogane believed Fay was going to avoid feeding anymore. He'd seen the change in the vampire, understood it implicitly, and respected it, too, because hating Kurogane had been easy and choosing But it had only been a few weeks since all that changed - it still took checking, just in case.
Fay's stance, his voice, were even and normal. Kurogane believed him.
So he took Fay's advice (yes, yes, shocking) and he soaked. To Kurogane's irritation, it worked, too - he did genuinely feel better. Thank goodness the arm was waterproof.
He leaned back and closed his eyes, stillness betraying how good it felt to sit there. He was not usually someone to lean into inactivity like this, to sit around and savour simple, good sensations, but he figured that the weightlessness of the arm now would make his drills with Ginryu so much less painful later.
The shoulder was always sore now. For a minute, in the hot spring, it wasn't at all.