A/N: This is what I think likely happened when Sirius tried to get Snape killed by telling him how to get near Lupin under a full moon. Set in Marauder's/MWPP era, in their 6th year. Lily's POV.
I thought this was one piece of history that needed some filling in. I hope I'm accurately representing the characters and their (possible) relationships at this time. Please read and review.
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"You want to know how to get past the whomping willow?" Sirius glanced around after he said this and noticed Lily listening, his eyebrows raised in a phoney look of polite curiousity. "Can I help you, Evans?" a strong note of sarcasm in his voice, he obviously didn't appreciate her eavesdropping.
"No," Lily said simply with the same amount of sarcasm, and turned back to her parchment.
Sirius continued in a quieter voice, but straining her ears, Lily could still hear him. "So do you want to know how to get past the willow?" Still, Snape said nothing. "Just prod the knot at the base of the trunk with a stick and it'll freeze." At this point McGonagall had finished her conversation with Flitckwick and returned to her desk. All the students promptly resumed their writing.
"Evans, Snape: you're free to go." Good old McGonagall, making those who deserve the most punishment stay longer.
Snape quickly gathered up his belongings and hurriedly left the classroom. Lily stuffed her quill and extra parchment into her bag and with a curious glance at Sirius's smirking face, walked out of the classroom.
Well, it certainly has been a weird day. I just wish I still didn't have that arithmancy essay to write....
Of course, I would have had it done already if I hadn't been stuck in detention! Lily recalled the day's events...after lunch the sixth-year Slytherins and Gryffindors were waiting outside the Transfiguration classroom, Sirius Black and Peter Pettigrew were talking quietly, no doubt waiting for their friends Remus Lupin and Potter. A group of Slytherins were passing by as they were waiting. Bellatrix Black had bumped into Lily -- probably on purpose, now that I think about it -- and said "Watch it, mudblood!".
Before Lily had a chance to respond Siruis Black's stepped forward, "Watch your mouth, Bella!" Despite the animosity between Lily and Potter's gang of friends, Potter, Sirius & co still lept to defend Lily Evans or any other muggle-born or halfblood that was insulted. Upon reflection, she realized that Sirius probably wouldn't mind getting in a fight with his vicious cousin, either. Lily had heard that Sirius had had a "falling out" with his family; he rarely spoke to anyone in the Black family now, and pretended his younger brother Regulus didn't exist.
"Well, well," Bellatrix had responded. "If it isn't the black sheep of the Black family!"
"Why don't you go jinx yourself, Bella?" Sirius who was now holding his wand out threatenly.
"Oh...is wittle See-wee-us angwy for a change? Standing up for your wee half-bweed fwends, are we?" replied Bellatrix using that annoying baby-voice she does.
This was too much for Sirius; he shot out a spell but Bellatrix blocked it and sent out one of her own, but Sirius deflected it and it hit Snape, who had been standing a small distance away from the fight. Sirius hadn't noticed this and continued duelling with Bellatrix, but Snape had whipped out his wand and shot a spell back at Sirius. Next thing Lily knew, Sirius was fighting both Bellatrix and Snape, but Sirius had stunned Snape before long and continued agaisnt Bellatrix.
Lily's frustration with all three of these people got the better of her -- she wished they could all stop fighting and acting like such gits all the time! She sent out a spell to both Sirius and Bellatrix, her anger rising. As both of them fell and then rose; Sirius with a mixture of annoyance and confusion on his face, Bellatrix with hate. Realizing she had better do something more productive, Lily yelled "Expelliarmus!" pointing at both Bellatrix and Sirius. Bellatrix quickly recovered and sent a spell towards Lily but she deflected it and it hit -- James Potter! Potter was winded and knocked backwards into Lupin who stumbled but caught him. She noticed Remus had been looking ill again, lately. One of these days she meant to ask him if he was all right. Several muggle diseases popped into her mind... But he was always surrounded by Potter, Sirius and Peter: there was never the chance to ask him. Maybe they did it on purpose to annoy her. Now I'm just being paranoid. Maybe they do it to protect him, or something. It's strange, but despite all the things she hated about those boys she had to respect their loyalty to each other.
"What the heck are you guys doing? What's going on?" asked James -- I mean, Potter -- in a breathless voice
"I should like to know the same thing!" Apparently McGonagall had arrived the same time as Potter and Lupin.
McGonagall stared around beadily at the crowd of students.
"B - Bellatrix attacked Sirius and Evans, Professor!" piped up Pettigrew.
"That's a lie," hissed Snape as he got up from the floor. "He attacked her."
Lily then explained what had actually happened to the transfiguration teacher. They each had twenty house points taken from them and recieved detention.
Later that day between classes Lily had walked into yet another fight between Sirius and Snape -- only this time Potter was there too. Rather than duelling, though they seemed to be having a heated argument. She lingered there for a moment, until Potter spotted her -- his hand automatically messed up his hair -- and caught her eye and looked as if he was going to say something. She turned around, rolling her eyes. She'd had enough of their stupid fights. She wasn't going to bother being referee anymore. It just wasn't worth it. Snape was a biggot and very bitter (but that could probably be blamed on a certain Gryffindor in Lily's year!) and Sirius and Potter were misguided bullies who thought themselves heroes for the muggle-borns. Not that muggle-borns didn't need defending, but the way those guys went about it was all wrong. They had spent so much time bullying and humiliating Snape in the name of "defending" people like Lily, when they were just as bad as the bigots who called her a "mudblood". That wasn't the right way to fight people who agreed with megalomaniacs like You-Know -- Voldemort! Dumbledore said we shouldn't fear his name, that we should call him Voldemort.
She couldn't curb her curiousity, though. Lately she had noticed a distincly venomous enmity between Snape and Sirius; far beyond what was between Snape and James (if that was believable!). It was subtle, but it was there. She wondered though, if part of it had to do with issues with his family, or maybe it was just out of his loyalty to Potter? Potter, on the otherhand had recently had the audacity of trying to not be so much of a prick lately. As if that would make her like him better. But even if she even remotely felt the slightest bit attracted to him, she would never, never like him that way. He was too much of an egotistical ass. Never. Why does he keep trying to get in my good books? Why doesn't he just give up already? Uhg. I spend far too much time pondering the minds of those idiots.
She gave herself a mental shake as she reached the Fat Lady's portrait. "Bubbly Broomsticks," she said and crawled through the hole in the wall into the Gryffindor Common Room.