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Modern AU with magic. Sex or die curse. They've had this arrangement for years now and it works. For Arthur, it's a duty, one he used to enjoy but doesn't anymore, and for Merlin, it's just something he has to do, like eating reasonably healthy food and getting enough sleep. The sex is part of their routines, a secret neither of them admits to anyone else, especially not to their partners. But maybe there is someone out there who can help them. And maybe, when faced with losing their connection, Merlin and Arthur start to rekindle a latent flame.