Legendary Legacy said:
And that's that. Maybe I'll write more, but honestly I don't really know where to take this story without simply rehashing canon with Keitaro's condition being the only real change. Any ideas?
Hmm... Well, since it's been stated that Negima and Love Hina are in the same universe, there could be a brief crossover arc. Perhaps with a grown up Negima crew consisting of the 'core' group of Negi's love interests. They show up, looking to get into Tokyo-U themselves and the girls check out the Inn for housing.
After things get sorted out about Keitaro, it opens up for a trip to Negi's magical academy and then into the magic world. Granted, you'd have to come up with a new series of villains/problems. I can imagine some interest from a few villains looking for a way to reduce their losses or a key to immortality.
You could even have the Urashima's have a reputation in the magic world similar to the Giant Clan in Jade. Warriors renown to be unbeatable and unkillable, and so they're *very* highly valued as Pacito partners.
Such an adventure could easily replace the cannon problems that kept Keitaro from getting into Tokyo-U, and offer good tie-ins for Seta.