She looks for all the world like she doesn't believe them, but after a moment of consideration, she thankfully decides not to press. "Alright. I'll be heading to bed, so the kitchen is all yours if you change your mind." The look she gives them both then is a little sharper. "We'll have plenty of time to speak more in the morning."

"G'night, Mom," Kris signs, somewhat lamely.

Kris turns to Frisk as soon as the door closes behind her. "That...went well," they say. "Um. You should- should sit down." Or something. Before they like, pass out.