Simon wasn't sure what to make of the remembrall, but then again, he supposed it wouldn't matter once he had gotten rid of it. She thought the thing was faulty as well, so it was probably just a matter of someone creating it incorrectly. In the end, they'd find out one way or the other, and he could go from there. Simon, as a rule, had refused to be much of a planner. Why would he bother when he could be wrongly accused and put in Azkaban for something he hadn't even done? What was the point in planning things that would inevitably be ripped away from you?
Something about that struck an odd chord within him, but he pushed it away. It was probably just because they were both so surprised by the object at hand. Pun intended.
So he chuckled and nodded in return, even though it wasn't what he would've called a joke, per se. Still, he saw no harm in being friendly around a former classmate. Particularly a charming and attractive one. So he draped an arm over the back of the couch between them, lounging back a little as she wrote. Of course, when she finished, he was surprised into slowly lifting an eyebrow.
"I don't have anything set in stone," he told her, his tone curious but open. "I was going to clean up a bit, perhaps, but nothing big. Already ran my errands," Simon added, inclining his head towards her teasingly. But he sat back again, eyeing her with interest. "Why?"