It was honestly a rare occasion. Parthenope respected her sister's boundaries, particularly where this space was concerned, mostly because she didn't understand anything going on in this room. At all. Every time she stepped in there, she had to bite her tongue to refrain from asking what everything was.
"Oh yeah, I've been home for hours. Took a shower, made dinner, made two new pillows for the couch..." Actually now that she thought of it, it was probably not a good thing that Peisinoê hadn't emerged from the lab in all that time, because she'd been home for a while.
"Maybe you should... come out of the lab then, and have some cocoa? When was the last time you ate?" A while. That was the most conservative answer. It had at least been since before she came home, but if she knew her sister--and obviously she did--it was probably longer than that.