Getting Sirius

Remus meets James and Sirius through Tonks, or rather through a bookstore. Either way, Tonks has found herself immersed in the lives of her old friends all over again and when she hears of the increasingly tense environment that Sirius' shared flat has found itself in, she offers him a place to stay. He shows up, his clothes soaked through, clinging to his frame, his hair dripping, and his eyes pleading. He stays. Much to the dismay or Remus, who hadn't been able to get the dark-haired boy out of his mind since meeting him. The two find themselves bonding. (It's all v wholesome. No smut and only some mild language, lots of cute fluff. Remus is self-conscious about his past but Sirius is nice and flirtatious and it's all a big cute mess.)