It felt like a long time had passed since the last time they met, and it was long enough to make Severus feel nervous about the upcoming meeting. He had promised himself not to slip into a deeper relationship, to keep her away, but after a week of not seeing her it felt like he couldn't say no to her invitation.
Maybe it was because it had been her birthday, or maybe he just wanted to see her. "Last time." he told himself as he knocked on her door, making another promise to himself not to meet her again like this any more.
She was everything he wasn't allowed to touch, he was not supposed to be seen with a muggle lover when things were getting so tensed again. He just had an hard time faking it when she was around, and that would end up putting her in danger, just as well as his never-ending mission.
He walked inside when he heard her voice, biting on his lower lip, pale and severe like his usual. "Good evening." he said slowly, closing the door behind him.