Severus was mentally counting to 10 a few more times, it really was so hard to not just give Sirius a piece of his mind. He wanted to point out to Black that he was the one that was hardly ever along, acting like Potter's little pet. That could wait though, now he had to make a great impression on Lily.
It was pretty clear to him that Lily was not enjoying her fellow Gryffindor's company which was, for now, good enough for him.
Severus gave Black a very dark 'if looks could kill'-glare before focussing his attention on Lily, smiled at her and started to lead her away.
---
The moment Remus saw Severus' intention to leave with Lily the wolf released a breath he hadn't realized he was holding. This time his secret was still safe, he decided to be more vigilant in the future though.
He gave Lily a small apologetic smile before turning to Sirius, "want to go the the lake?" He hoped he could put as much distance between his friend and the Slytherin as possible.