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[love_glows27]

It's a Remus/Siris fic (literally the only one of those I've read, actually) and it has Remus joining Hogwarts only around his sixth year and he isn't too happy about it. Until he sees Sirius and quite literally falls for him at first sight. And to his surprise he makes friends with the other Marauders and Lily and one day he blurts to Sirius that

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[rinsaikeru]

I think you're looking for "That Old Black Magic" by fallovermelikestars, which you can find here: http://archiveofourown.org/works/791599

[love_glows27]

That's it! Thank you so much!