Severus was just an inch away from hexing Sirius, he really wanted to be the mature one but Black was not making things easy for him. He did the whole 'count to 10'-thing not just once but twice, adding a few 'I am not going to kill Black' for good measure.
If Black could ignore him, he could ignore the bully back. He offered Lily his arm like the gentleman he wanted to be, "Let me escort you back to the castle, Lily." He said wondering if he ever would get the chance to take her to a ball, if he would this would be good practice too.
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Remus got to the scene of impending disaster just in time to hear Severus speak. 'Yes,' he thought. 'Say yes, Lily' He tried to put the thought in the redhead's brain. If they left he could catch Sirius before his secret would be common knowledge.
He might not hate the Slytherin but he was not sure he trusted Severus enough to keep the fact that he was a wolf secret when he got angry enough.
"Hi." Remus tried to sound as happy as he could. "Isn't it a nice day?" Mentally he hit his head, brilliant Lupin!