[Look, he's so used to just getting meeting notices sent and the what have you that he doesn't think about replying. He just has a blanket acceptance that he'll be there. That, and Wriothesley's use of the watch is so minimal he spends most of it just reading things than actually replying. He thinks very little about making a reply.

Wriothesley folds his arms over his chest with an easy smile.]

Yeah? Was I supposed to decline or something? [Oops, maybe he should have replied. He'll remember to reply next time.

Also, Lorenz, he always has his sleeves rolled up to his elbows. He has never worn his dress shirts properly in his life.] It's different to see you dressed down. I think I could also get used to this look on you. Can I come in, monsieur?