AN/ I always believed that Snape and Lupin, though there was still a lot of hatred there, could probably get along the best out of anyone else of the Marauders. The most potential for actually having a slightly civil conversation, or the closest thing to it at least. This is my take on that.

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After Sirius Attacked the Fat Lady

Lupin's mind was all over the place. At the same time he was thinking about the old days with James, Sirius and Peter, then about James and Lily's death, then about him worrying for the students, more specifically Harry Potter, and questioning where it all started and how it all went wrong. Any lesser minds than his would have been spasming at all those thoughts.

He was just sitting in his classroom leaning in his chair and looking down towards the empty desk seeing nothing.

Sirius had never been such a violent person minus a few events, such as when he sent Snape to the Shrieking Shack during a full moon, and well... anything else regarding Snape. All those times should have been the indicator about what he was capable of. They all thought he was the white sheep of the Black family (as Sirius had so liked to put it) but turns out he blended in with them all too well. When you live with evil, Lupin guessed it was bound to consume you.

Snape came in and saw Lupin sitting at his desk. "Hello, Severus."

"What are you doing? It's a full moon tonight, Lupin."

Lupin shook his head, "It won't start for another hour or so. And I've taken the potion if that is what you're concerned about." Snape didn't say anything, he just stood there. "I guess we finally have one thing in common after all these years."

"And what would that be?"

"Hatred for Black." Snape snorted at that comment. "I know you suspect me of helping him, but that is the last thing I'm doing."

"Sure, let's say I believe you."

He turned around to leave Lupin, but he quickly called out. "He killed them, Severus." That stopped Snape at the door. "James, and Lily. He may not have held that wand and said those words but he is as much to blame as You-Know-Who for why they are dead. I know you feel nothing towards James but Lily... she was your friend for a time."

Snape snorted and turned towards Lupin, "Yeah, for a time, a time when we were children. And you were equally friends with both Potter and Black, so, if you can show as much loyalty to Potter, you can do so as well to Black. Don't think talking about Lily is going to make me suddenly trust you, because the last thing we were when she died was friends, making her almost nothing to me then."

"I don't believe that."

"That is your opinion." Lupin could see the facade behind Snape's eyes. He was a skilled legilimens, and honestly he had to be a good actor too, or else he wouldn't have been able to successfully spy for the order.

Lupin stood up and went towards Snape, "If you cared nothing for Lily, then why did you turn sides during You-Know-Who's reign."

Snape was able to think very quick on his feet, more so cause he prepared an answer for whenever someone asked him this question. The last thing he wanted was for everyone to know what a love sick puppy he was towards Lily Evans. "Let's say what they advertised for being a Death Eater and what it actually was were two completely separate things, and I didn't agree with it."

Lupin shook his head. It was shocking how bad he was during this conversation. His persona he was trying to give was a huge failure, even Snape had been aware that he failed miserably. "Of course, sure. Anyway, I could transform any moment now, and I don't think you want to see that again."

Snape snorted and left the room. That was probably the most civil conversation they ever had or were ever going to have. Maybe it was possible for him to be a decent person and actually be caring, after all, he did come all the way here to make sure that he was all set for his transformation tonight.

The full moon reached it's peak, and Lupin could feel his body start to change.