AN: After reading everyone's brilliant spinoffs of Dreaming of Sunshine, I decided to try my hand at it. This story follows DOS until Ch 107, where it diverges during the summon scroll mission for Sasuke.

The Security Applications of Temporal Compression Seals

part i of ?

oOo

Jounin Hatake Kakashi was having a good day. He was on a mission (a simple C-rank scroll retrieval mission) with solid intelligence of its location (an old Uchiha clan base/storage facility within the Land of Fire) and the surrounding security measures (clan records helpfully provided by Sasuke) accompanied by one of his cute little genin. It would be great opportunity, he decided, for some bonding time with one and only female student as well as a chance to introduce her to the fine ninja art of breaking and entering (followed by the equally important steps of retrieving and exiting.)

Branches passed under his feet as he leaped from tree to tree towards the old Uchiha clan outpost. It was about as perfect a set up as possible for the retrieval of a scroll from a secured location, he mused. There would be not other shinobi to avoid, they had accurate information about both the layout and security features of the building and permission from the owner of said scrolls for their retrieval. In fact, Sasuke had thoughtfully donated chakra (currently being stored in one of Shikako's chakra stone research projects) to help them past any Uchiha security features that required more than the Sharingan to bypass. Really, he thought, with such preparations there was no reason for anything to go wrong on such a simple mission.

oOo

Unfortunately for Jounin Hatake Kakashi, there were two very important factors he did not take into account for this mission.

The first factor was a security flaw that he himself had revealed to the Uchiha clan. With Nohara Rin's successful transplantation of Uchiha Obito's left eye into Hatake Kakashi, there was now a non-clan Sharingan user. In addition to now having access to the clan's kekkei genkai, Hatake could now theoretically access a number of secure Uchiha faculties and tightly held clan secrets whose security measures centered on the Sharingan. Dojutsu thieves in the past had been hunted down and killed; but as a fellow Konoha shinobi, Hatake was safe from such retributions. Once negotiations for the implanted eye's return failed, the Uchiha scrambled to revise clan security measures and develop new ones. The clan felt no need to inform the barely tolerated non-Uchiha Sharingan holder about clan-specific security updates; especially to outposts he had no business being at.

The second of these was that, as wife of the Uchiha clan head and accomplished kunoichi, Uchiha Mikoto had been consulted about improvements to the security of a number of clan holdings, including this particular outpost. Mikoto knew that any shinobi seeking to break into clan holdings would expect Uchiha style security measures, such as traps and hidden compartments only detectable to the Sharingan, and plan accordingly. Which is why she recruited her personal friend and seal user Uzumaki Kushina to help her develop new security measures for clan outposts.

oOo

It is widely acknowledged by shinobi that there is no such thing as a perfect security set up. Eventually someone is going to break into somewhere they shouldn't be by either finding a way to defeat the security measures in place or by developing a technique isn't accounted for. One method of countering this is to have unaccounted for traps or levels of security in addition to what is expected or recorded to be in place. Additionally, if a break-in occurs, steps should be taken to ensure that the trespasser does not get away cleanly or make it so they can be tracked down easily.

Or at least, this was the rational Kushina proposed to Mikoto for the temporal compression security seals she had designed.

"It's brilliant dattebane!" gushed Kushina, "The seal not only compresses the chakra and physical bodies of the trespasser down to a preset temporal point, but the compression of both of these at once will block their most recent memories. And really Mikoto-chan, which would you rather track down: an adult shinobi who just got in and out of a secure location or a baby ninja who has no idea where they are or how they got there?"

Uchiha Mikoto privately considered a seal that turned adults into children to be an oddly convoluted method of improving security; but she nevertheless incorporated the seal into several clan hideouts containing weapons, seal scrolls and other items of value. The temporal compression seal was attached to a sensor that was triggered by the presence of a signature of several chakra-containing items of importance and the corresponding lack of an Uchiha clan member chakra signature.

oOo

The breaking and entering portion of the scroll retrieval mission progressed without a hitch. In Kakashi's professional opinion (shaped by many years of experience in breaking onto facilities similar to this), the stronghold's security was a shining example of ninja paranoia at its finest. The Uchiha clan outpost had a variety of security measures from traps to hidden rooms only detectable by the Sharingan to a mislabeled air tight room filled with toxic gas. Fortunately, all of the security features between them and the summoning scrolls were easily disabled or avoidable with a combination of wits, borrowed Uchiha chakra and the Sharingan.

Really, Kakashi thought, he should remember to thank Sasuke for such a wonderful learning opportunity. Not only was this an excellent chance to demonstrate for Shikako some useful life skills, but his adorable student was also using this excursion as a field test of her chakra storage stone project.

With the retrieval successfully completed, they made their way back to the outpost entrance resetting traps as they went. Kakashi was restringing the trigger to a basic kunai launcher above the front entrance when he noticed two things: that the Uchiha chakra was no longer being emitted from the storage stones he and Shikako had in their pockets and that there was a seal beneath their feet that was rapidly gathering chakra for some no doubt nefarious purpose. Judging by her wide eyes, Shikako had also noticed the seal activating but was staring down at the ground, frozen in shock.

Kakashi had a split second to run everything through his head. Shikako was standing closer to the edge of the seal than he was, and really, what kind of sensei would he be if he allowed one of his precious students to get hit by a mysterious security seal? So in the moment before it activated, Kakashi darted forward and pushed his student out of the seal. He saw her hit the ground outside the seal before there was a feeling of crushing pressure and he blacked out.