Apparently, being invisible for this long removed Simon's memory of what his own outfit looks like, despite being fully able to see himself. He's bashful for a moment, particularly when he realises he just unveiled himself to an extremely fit girl. He knows he's hopeless with girls, so he already has no plans to try flirt with her, but what's more important is that she looks completely lost.

He can relate.

"Oh- You aren't keeping me." He sputters a little from how quickly he feels the need to blurt that out. "I've just been sitting here. Guarding, I suppose." He sounds a little despondent, because it's been extremely boring thus far. "Is there a reason you've been standing here so long?"