Ji couldn't help smiling because she knew how much it meant to Mari to have them together. It'd be easier to look after them, after all, and he did have a point - it'd give her extra time to spend with Harmony as well. Her eyes shifted down to Harmony as well and she offered a quick wink before answering Mari's questions.
"That sounds good to me." Ji was generally easy to please, after all, and generally went along with whatever her siblings wanted to do. Brushing her thumb affectionately over Harmony's cheek, she looked back to Mari with a grin. "If we're staying in, I'm totally stealing a shirt and a pair of boxers to lounge around in."