A.N: Spoiler warning from chapter 482! Well, to those still keeping up with the series (like me), you'd know what I'm talking about. Haha Anyway, for those familiar with the anime Ouran High School Host Club, I have another story with the same theme written with the KyoyaxHaruhi pairing. Title is "Lessons". Feel free to check that out. The link's somewhere on my profile page. Haha
Disclaimer: I obviously do not own Naruto nor Ouran nor any of the theories below. Please comment! Thanks! Arigatou! Salamat! Haha
Being their sensei since their genin days, it was Kakashi's responsibility to educate and equip Naruto, Sasuke and Sakura with the skills and jutsus, which would harness their potentials and mold them to become the best shinobi they could be.
However, no one, not even the famed Copy Nin of Konoha, would have anticipated how everyday mundane lessons, taught inside the classrooms of non shinobi affiliations, would manifest its application in the romantic development between Kakashi and Sakura.
Lesson #1. LE CHATELIER'S PRINCIPLE
"When a system at equilibrium is disturbed, it retains equilibrium by undergoing a net reaction that reduces the effect of the disturbance"
The deaths of Obito, Rin and Minato-sensei meant not only the loss such valued shinobi and skilled teammates, but also beloved family members. This lead him to create numerous barriers around him: the mask, the hitai-ate, Icha-icha, mission-mindedness - a measure to conceal his vulnerability and prevent any more emotional and psychological scarring.
However, the introduction of Naruto, Sasuke and Sakura in his life lead him to gradually lower down his defenses an embrace the possibility of a new beginning, a new family, a remedy from what life had lead him to become.
Lesson #2. SPONTANEOUS GENERATION THEORY
"Living things originate from nonliving things"
If it weren't for him being a functional individual, he'd be no different than any other inanimate object. An emotionally detached "machine" programmed to place the success of the mission over the welfare of the team.
It took just one cute emerald eyed, petal-hued haired kunoichi to make him realize he's capable of something unanimity couldn't procure.
Lesson #3. NEWTON'S LAW of UNIVERSAL GRAVITATION
"Every particle in the universe exerts an attractive force F on every other particle; given two particles with masses m1 and m2 and are separated by a distance r, the force exerted on each other has a magnitude of F= G m1 m2 / r"
By way of increasing magnitude of gravity (F), Kakashi (m1) feels a strong force of attraction to Sakura (m2) as the distance between them (r) decreases.