"I'm fine," Sirius insisted, getting to his feet. "I'll be right back!"
Heading downstairs, he fetched a glass from Hemingway's kitchen and filled it with cold water. On his way back through the werewolf passed him the potion for Remus and he took that with him, heading back upstairs.
Sirius let himself back into the bedroom and offered up the vial of potion first. "Drink this, Moony, then water. This'll ease the pain and put you into a good sleep."