Interesting. Even though crazy, Severus is more in touch with what Love is than Remus. I'm very surprised that Sirius was helping so much and why all of a sudden was he talking kindly to Severus? Did someone he know behave the same way that Severus did and he can see that person in him? How did he know to heal dark magic cuts? I'm curious as to what's going on in Sirius's head right now.
Oh, you might want to fix your coding. It starts with the word "Expelliarmus" I don't much about coding, but you may have forgot to add the end coding after "Expelliarmus" because the rest of the story is in italics also. I'm guessing that's not what you had intended :)