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The physical contact they have during the day is minimal: Tadashi handing him the files he needs to review or handing him his coffee, a glance through the mirror, nothing that can be obvious or inferred, no relationship between them except of an employer and his secretary and most days is almost an ache.
So when they get to the suite of the hotel, as soon as the doors are closed Ainosuke can kiss him the way he has wanted for hours, grab the knot of Tadashi's tie and bring him close; Tadashi shivers in his arms and his hands are as desperate as Ainosuke feels as he undoes the buttons of his vest and shirt, the two of them leaving a trail of clothes as the move into the room.
But Ainosuke doesn't take them to bed. He leans against the window, grabs Tadashi's ass and brings him close, lets his dog nuzzle against his neck and bite right below where it'll be hidden by his shirt but where Ainosuke will *feel* it smarting and he groans, pushes him away just enough for them to finish undressing, doesn't give Tadashi the chance to ask him anything before he turns over, hands against the window pane, legs splayed for Tadashi.
"Like this... " Let the world see him, them, this, and Tadashi is as good as he ever was because he presses close, licks at the nape of his neck, teases with his teeth without biting, but then he keeps going, and like this, for the world to see how Tadashi's tongue trails down his back, mouthing at the base of his spine with devotion before his hands spread Ainosuke's ass, and then Tadashi is licking into him.
It's the way that Tadashi is a silent lover but for the taste of him he moans, his hands tight on his thighs as he opens him up.
"Good dog, just like that," Ainosuke moans, and through the window's reflection he can see the tight hold Tadashi has on his hips, knows that it's going to bruise and he shivers with want. "Give me your tongue, give me everything, Tadashi, just like that, fuck into me."
Tadashi *moans again* at his command, the sweetest sound Ainosuke will ever hear, and he gasps and lets go of him, but before Ainosuke can demand more he feels the press of Tadashi's fingers breeching him.
"Just like that, so good, Tadashi--" he pushes back against his fingers, feeling the stretch of it to his toes, with the way Tadashi fucks him, because his Tadashi knows just where to press and how to stroke, keeps touching his prostate just enough to make it almost impossible for Ainosuke not to reach for his cock, but even that wait feels like glory.
"Enough, Tadashi; fuck me now," he commands and he feels the way Tadashi shivers, but his dog obeys and he stands up: the reflection is enough for Ainosuke to see the hunger in his green eyes, the need Tadashi has for him, for this; Ainosuke keeps his eyes on that reflection even as Tadashi's cock pushes against him and fills him up and the way Tadashi's face goes slack with his pleasure feels like electricity.
"My Tadashi," Ainosuke gasps. "You feel so good inside, now, fuck me, nice and deep."
Tadashi's 'yes, Ainosuke' is a breathy moan and his dog trembles and pants, hands tight on Ainosuke's hips as he starts fucking him; Ainosuke moans, low and satisfied, at the slow rhythm Tadashi starts thrusting inside him, his skin hot and sensitive, before Tadashi gets into the proper rhythm and fucks him harder, deeper.
"You're doing so good, puppy, keep going," Ainosuke moans, and he's still resisting the urge to touch his own cock. "Does it feel good?"
"Y-Yes, Ainosuke-sama, so--" A moan; Tadashi's eyes find his through the reflection, his gaze molten, and Ainosuke feels his balls ache each time Tadashi fucks deep into him like that, his own cock swollen and sensitive. "Please, can I touch you? I want to make you come."
He laughs, breathless, and he was, maybe, edging himself, but how can he deny such a request? "Such a selfless dog. Go on, then. Make me feel good."
Tadashi shivers again and then leans closer, mouth against the back of his neck again, and the next time he thrusts his hand slides inward to wrap around his cock, stroking him in time and oh, waiting has made it so good to be touched.
"I-I want to," Tadashi moans against his neck, gasping. "A-ahh, Ainosuke-sama, I'm-- ahh, can I--? Please."
He laughs again, moans, considers being mean just for a second, because he knows that Tadashi would keep on fucking him until he tells him so, but instead he nods.
"Yes, good dog, come for me, fill me up, give me your love, Tadashi--" and his voice is ragged and then it catches in his throat as Tadashi fucks into him harder; Ainosuke feels his own orgasm building, covers Tadashi's hand on his cock with his own to move it as well and he can feel himself on the edge, almost there, and he moans Tadashi's name as he comes, feeling Tadashi's teeth on his shoulder when he comes as well.
When he can open his eyes, they're almost merged in the chiaroscuro of the glass reflection, here half of Tadashi's face against his neck, Tadashi's forearms around his waist, Ainosuke's own satisfied expression. He wishes for a picture for a moment, dismisses it almost as soon as he thinks about it, and instead simply keeps on enjoying the afterglow for a little while longer.