Synchronising our timetables

Me: OK, my love, here's what's going to happen. I have a private lesson in Zographou from 3.30 to 4.30. When that's finished I'll drive back home to pick you up at 4.45 and then I'll take you to you art class at 5.00. But you must make sure you're ready when I get back, because I have to get to another lesson at 5.15.

Emily: Wow! Two lessons in one day. That must be really exhausting.

Me: [suspiciously] Are you being sarcastic?

Emily: No, no, no, I really wasn't. [Giggling] But it really did sound like I was, didn't it? [Sniggering] Two lessons! Exhausting! Ha!