Katsuki is chopping away vegetables, and making dinner. He grumbles about how he's being treated like a maid. Rei is playing "Morio Kart special edition" stealthily eyeing his pack of cigarettes while Katsuki isn't looking.

Rei: Uh... Katsuki?

Katsuki is busy mumbling away.

Rei: Katsuki, where is the kid?

Katsuki stops chopping, and starts freaking out.