"It did sound a little sarcastic." Just a smidge. A tad. But, and this is just going off of her limited exposure to him, she's pretty sure that whatever he says is going to sound slightly sarcastic half the time. He probably couldn't help it.

"Anyhow, I mainly just helped a bit. Catra did most of the work on this one." It was true! Mostly. Sure, Tenten had separated some stuff, but Catra did do a load of grunt work. "We were just finishing up and, well." There's a slight shrug. There's not a whole lot of question as to what's on Dave's mind now, even as impassive as he was. What other reason would someone have for coming to the kitchen at night?

...Wait a minute. "Say, Dave. How long have you known that the night staff was totally fine with us being in here?"