Fics like Silver Souls (He's the one for me)

Sirius Black and James Potter are FBI agents that have go back to London for a suspect, Greyback. While he's there, Sirius meets a mysterious man that may have taken ahold of his heart. And James, well, he might've found the long-lost brother that Sirius has been looking for since his childhood. OR Remus Lupin works for Greyback, Regulus is right by his best friends side. Sirius and James are there to stop the man with their team, but it soon becomes obvious they don't know the whole story. It only gets more complicated when feelings get involved

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