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You didn't need a Sharingan to notice the tension in Shisui's body.
Kakashi watches as the Uchiha paces back, forth, and then catches his eye, immediately stilling as if Kakashi hasn't been in the same room as him for the last half hour. What makes today so stressful isn't important (especially since Shisui's nerves are so cute, but he'd take that to his grave). Instead, he's worried about Shisui's spiralling.
"Uchiha."
Shisui stops in his tracks, snapping his head over. "Yes?"
"You're going to make depressions in the floor if you keep pacing like that."
A pause. "It's helping."
"Are you sure? Because from what I see, it's only making you more anxious."
Kakashi doesn't even look up from his book. He doesn't have to - at this point, Shisui's easier to read than Icha Icha. Not because his heart's on his sleeve, but because the guy's crafted from elegant typeset and cleanly split chapters without any plot holes. He notes the freezing up, the tension in Shisui's muscles, then the slow, agonisingly slow relaxation.
"What's that thing Iruka always says...? Oh yeah. Worrying means you suffer twice."
His drawl makes Shisui smile. The Uchiha finally caves - walking from his stupid position in the centre of the room to sit next to him. Finally. Kakashi's been cold this whole time, and his boyfriend radiates heat like a fire. Perks of being fire-natured.
As soon as they're next to each other again, Kakashi slips his hand into Shisui's with a grin. "See, isn't this so much better?"
If he could wink, he would. Instead, he gives his best crescent-moon-eyed smile, and lets Shisui lean on his shoulder, a soft groan coming from his lover's lips. "Yeah, yeah. Sitting next to you is better than standing. Happy?"
At that, Kakashi squishes Shisui's hand, gently stroking his index finger with his thumb. "Ecstatic," He mutters, setting Icha Icha down. He'll read it later.
"Mm, great. That was the goal. Now let me be anxious in peace, will you?"
A light laugh comes from Kakashi's lips, and he turns his head, pressing a kiss to Shisui's head. They're still holding hands, and the intense warmth of Shisui's body has slowly been mellowed out by Kakashi's freeze. Finally, comfortable.
"Yeah, sure."
He'll be happy as long as he gets to keep their fingers intertwined.