Moony curled up into Padfoot. He was scared. He didn't really know why, but he was. He didn't think Padfoot would leave him, or anything like that, it was just that things were changing Moony wasn't ready for all this. Wormatail then Lily and now all of this. He wasn't ready for it.
He leaned up and kissed him. He needed that. He needed the normalcy... if kissing your best friend could be termed as normal.