Harry had missed much of his childhood and teenage years. Now that Voldemort has been defeated, he's beginning to realise just what he missed. (RemusHarry, memories of RemusSirius, vague mentionings of HarryRon -- Will start G but reach R).
Sirius had loved the rain, but Remus finds he can't quite leave it completely behind. Post OotP; Remus' POV.
In their 5th year, three boys finally master the necessary magic to end the solitude of their friend's life. And Remus knows exactly whose idea it was. Their first night at the Shrieking Shack, with Moony.
After an argument, Sirius has gotten a bit drunk, and gets himself into a mess with Remus. Slash.