Miscellaneous ideas topic.
Idea 1:
How about a simple room swap:
Lets put another girl in the room above Keitaro's room, instead of Naru. Like it or not, the two did bond somewhat over the accedents involving one peeking on the other, falling though in the middle of the night, etc.
What happens if we change that dynamic?
Idea 2:
What if Kitsune had toned down the flirting after Keitaro landed that job as a cook, and as such he never lost the job? We know keitaro has at least sweet's baking skills, and he didn't seem half bad at being a cook, so what if we ran with it? Part time cook job turns into an ever larger job, till after a year or two Keitaro is practically running the kitchen. Picking up recipies from Shinobu and the other girls, he's additions to the bar's menu are making the bar quite a name, and with that, quite a lot of money, not to mention making a name for himself.
This would be a pretty massive change from canon, since there would be no timeskip, as he wasn't going to america with Seta, heck, He would barely know Seta. The girls would view him a bit diferently, as what girl doesn't love a man who can cook? Doubly so for Kitsune, perhaps this bar/eatery is a favorite dive of her's?
Could see this ether going twords a Kitsune or Shinobu pairing myself.
Idea 3:
During Mutsumi and Keitaro's date, what if the mecha tama didn't blow up, ruining the date? either it malfunctioned, not activating the self-destruct, or naru never grabs ahold of the controls, whatever. The point is, the date goes off without a hitch, ends beautifully, and both people are left feeling all warn and fuzzy. Keitaro realizes that he could be in love with Mutsumi, Mutsumi starts to think she should throw childhood promises to the wind and presue Keitaro 100% and Naru is left wondering whats going on, and why Keitaro seems to have switched his affections so easily.