Tachihara wasn't going to argue. He'd just be dragged back by his scruff, he knows, which would be humiliating. And a short stay does sound nice...

"What kind of trouble?" But of course that's what immediately catches his attention, long ears perking up. If he's been out on some mission with boring humans while Jouno has been having the fun kind of trouble... Well, he's back now, which means he can throw himself into the middle of whatever it is.