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Remus Lupin had been in the hospital wing many times since he started attending Hogwarts School for Witchcraft and Wizardry. Some of the time it was because of a prank that backfire, or that he tripped and caught his head in the stairs (Sirius had to convince him to go on these occasions). But most of the time, he was in the hospital wing because his furry little problem.
Those visits were the worst.
Sirius Black hated the more than anything. He didn't believe in soulmates but if they were to exist, Remus would be his. So watching him lay there whilst not being able to help him destroyed a small part of Sirius every month.
Some months were better, all Remus would need is his wounds cleaned with some anti-septic and bandaged up. He'd miss morning classes but feel much better by the time the afternoon came. Sirius liked these months, these months were easy.
The hospital months were hard.
Sirius was helpless to watch as Remus writer in pain for hours, even days on end. Madam Pomfrey had tried to remove Sirius from Remus' bedside many Tims, failing at every attempt. Where one went, the other wasn't far to follow.
All he could do whilst he watched the boy he loved was to think back to when he wasn't in pain because of his lycanthropy. To how they would sneak food out of the Grand Hall to go have picnics on the grounds, how they would "study" in the library, to how they would cuddle up in Sirius' bed of a winter's night to try to fight off the cold.
But for now he was powerless so he chose to do what he always did: Wait. wait for Remus to wake up, wait for the pain to pass, wait for the next month where he would have to endure it all again.