It's a good thing that the one received this magic box was someone like cordelia and archie... Imagine if it was a wicked aristocrat or merchant instead of archie, they would milk this box to the max...
As much as i want a romance, i love seeing them like how they never had "oneesan" in their lives, ofc they would be clingy to her... I myself agree too, "ane-san" figure in a family is great '-')