Just had an idea for an arc I want to see in BaDIK and it does frustrate me that the author isn't here just so I could get feedback on the possibility because it seems fun. Basically, mini-arc where the MC uses what his dad taught him about House renovation/carpentry/construction to reform his new room in the mansion. Since the room is almost literally a human pigsty, it will need extensive renovations and the MC has said he'd love to do something like that, even if just to make his dad happy.
So the arc would be like this - MC would gather the money and materials for renovation, through mini games or quest-lines, and this would allow some degree of customization that end up in a pretty awesome room. The interactions revolving around it would pretty fun - Quinn and Sage could be interested if a bit mocking, would allow all the DIKs some showcase to see how they react and if they help and their expectations of it, Jill would be interested (and another thing in the mastery of unexpected things), Josy and Maya have the most obvious interactions due to the interactions that already happened, and Bella would be a big surprise. Always fun to see her being surprised. (and hell, maybe even Envy/Nicole having a reaction when we send pictures, go perfectly in the more mature image, and yes, almost impossible, but she's my favorite side girl -even if a non official one- so let me dream).
Main issue is that the room is still a pretty limited space to show off a lot, can't even get one of those TV awesome rooms. But hey, maybe they like and let you do extra work on the mansion hahaha - get an indoor pool.