Narcissa could only imagine what he would do if she actually insisted on coming along. Or worse, if she'd taken the Mark herself. Fortunately for them both, she never had any desire to go down that road. Her excuse was always that she didn't want a tattoo that would flaw her appearance and while that was true, it was mostly fear that held her back. It would have kept her from being able to raise Draco properly too, though given his state at the moment she wasn't sure about her parenting skills anyway.
"While I would love nothing more than to be at your side pointing out better methods to accomplishing your tasks, I'm afraid I must continue to babysit our lovely guests." It was rare for her to ever leave the Manor anymore, even when she wanted to. Her status as a social butterfly had diminished, though she's tried to redeem it as they were trying very hard to make the Malfoy name what it once was, and social status was a big part of that. The problem was that Narcissa was very protective of their home. Leaving it while it was occupied by those she did not trust was not something she could easily do. "I'll settle for hearing about your day when you come home to me. Just promise me you'll always come home."