James was nervous, yes. He couldn't lie to himself. Severus Snape was coming over to his house. He glared inwardly at the part of him that was telling him to do something mean. We are going to behave and listen to our wife. She is smart and he cares for our grandson. We will not do anything of the sort, he chided the voice quietly.
The knock on the door made his stomach squirm uncomfortably. However, Lily's words made him laugh. "I'll behave. I promise." He leaned against the wall behind Lily, smiling towards Al and looking cautiously for a moment at Severus. He pulled out his wand, reminding himself to be careful about that now. He had a somewhat shoddy record.
"Hello, Severus." He surprised himself by using the man's first name and it showed on his face. He forced neutrality back into his features and wrote out, "Welcome to the house." with a little smiling face at the end, just the way Albus and he had done before.