I may do another chapter if I get enough suggestions for other emotions. Have at thee. :D
Disclaimer: dood, fanfiction. Kingdom Hearts, Final Fantasy, and the characters and universes therein are the property of Disney and Square Enix. I receive no remuneration for this work; it is a parody and as such utilizes the Fair Use clause of the Copyright Act.
Cloud knew when Leon was agitated; he would pace and rant quietly, then try to calm himself by leaning against any available vertical surface with his arms folded and his eyes closed, sometimes with two fingers pinched just above the bridge of his nose. Cloud called this his "thinking time", and often brought him back by standing at his side and mirroring his position until the brunet cracked a smile.
Leon knew when Cloud was agitated; he would shut up, shut down, and disappear for hours, even days at a time. Leon called this his "thinking time", and often found him and brought him back with a mild touch to the arm or an affectionate thump on the chest and a nod towards home, depending on the mood he found him in.
Cloud knew when Leon was excited; his face would light up subtly and he'd straighten his already-perfect posture, so attentive and eager to learn or think or experience. Though introverted, he made a fine leader, and he was one they all were willing to follow.
Leon knew when Cloud was excited; his eyes would glow and his entire body seemed to radiate energy, and it seemed quite contagious to those nearby. Though reluctant, he made a fine leader, and he was one they were all willing to stand behind.
Cloud knew when Leon was angry; his eyes would narrow and his body would stiffen, and he would often retreat to his favorite training spot and practice hard for hours and hours in order to not take out his aggression, misplaced or not, on the wrong person.
Leon knew when Cloud was angry; his speech would become clipped and his mannerisms terse, and though he rarely lost his temper, people knew well enough to give him a wide berth if he stalked by, often chasing down Leon for an impromptu sparring session to vent his frustrations.
Cloud knew when Leon was sad; he became more reserved than usual, and didn't like to make eye contact. It was always hard for Cloud to see, because he believed there was nothing in the world he could do to make his reason for being sad go away.
Leon knew when Cloud was sad; he was able to hide this emotion fairly well, except from those he was closest to. Both Tifa and Leon recognized that look in his eyes, and both were equally determined to keep him from caving in on himself completely.
Cloud knew when Leon was aroused; his breathing would grow very quiet, very shallow, as if any sound or movement he made might scare the other off, but he was very responsive in other ways. He also had an instinctive need to keep the playing field level, something his partner never really seemed to mind.
Leon knew when Cloud was aroused; his eyes would close and his breath would hitch just slightly, and though he seemed stiff and restrained most of the time, in those moments, he was graceful and enticing. He also had a tendency to get very affectionate afterwards, something his partner never really seemed to mind.
Cloud knew when Leon was afraid; he'd flare up and try his damnedest to shield those he was close to with little regard for personal safety, though nearly everyone was quite capable of protecting themselves as well and shook their heads fondly at his valiance.
Leon knew when Cloud was afraid; he'd pull away in fear of failing those he was close to, thinking they'd be safer without him near, though everyone he was close to wholeheartedly disagreed and quite a few wanted to smack him over the head about it.
Cloud knew when Leon was happy; the smallest of smirks would cross his face and he would shake his head, then cross his arms over his chest and tilt his chin down a little, as if he would very much like to hide the expression.
Leon knew when Cloud was happy; the smallest of smiles would pull back one of his cheeks ever so slightly, and his vibrant eyes would shine softly, shyly, though he usually hid this trait and many others might have thought of him as being withdrawn.
They each knew when to push the other forward, and they each knew when to pull the other back. Maybe they really were too predictable, but maybe that's why they got along so well.