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Summary
Sirius Black has always known his Animagus transformation comes with certain inconveniences.
He had not, however, anticipated cramps.
Unfortunately, detention with Severus Snape turns out to be the worst possible—or perhaps best possible—place to discover that his magical biology has decided to become a problem.
Severus is perfectly clear about one thing: he still hates Sirius Black.
Sirius is equally clear about one thing: he needs Severus.
Neither of them is particularly interested in discussing what that means.