Tsuna wakes up on the floor of the living room.
At first he's just disoriented. Then he sits up to look around the room and achieves a state of brief confusion, rapidly seguing into faint alarm. He can remember the first part of the night - Dino pouring some brightly-colored liquid into tiny shot glasses and offering them around, Chrome escaping from the room as soon as a reasonable excuse presented itself, Kyoko smiling every time Tsuna caught her eye. It had been fun, until he had laid down for what had felt like a few minutes and awoken to find nearly everyone gone and the sun up over the horizon. Most of the guests are nowhere to be seen, though Haru and Kyoko are curled up with Bianchi on the couch, and Dino is lying in the corner with what looks like Hibari's jacket less the armband thrown over him and nothing else, as far as Tsuna can tell. That's it, beyond empty glasses on every available surface, a scattering of playing cards in a heap in the corner, and a red vest abandoned near the doorway with no sign of its owner anywhere in the room.
Tsuna gets to his feet carefully, wary of lingering dizziness, but his balance is steady, and no one shifts at the faint sound of him standing and stretching. In fact the room stays silent, so deadly still Tsuna feels like an intruder into the sleep of the others, and he only briefly considers waking them before discarding that idea. He doesn't really want confirmation of what Dino may or may not be wearing, anyway, and the warm morning glow of the sunlight promises a short-term distraction, if nothing else. Besides, he knows who that vest belongs to, and Yamamoto lives close enough that the walk over should be a good way to wake up while giving everyone else a chance to sleep a little longer.
It's only a few blocks. By the time Tsuna is coming through the gate to the other boy's apartment he feels far more alert thanks to both the warmth of the sunlight and the mild exertion of the exercise, and when he knocks at the familiar door it's before he has a chance to think that the other might not be completely awake himself yet. But Yamamoto is usually up far earlier than Tsuna, out for a run or baseball practice or something else before the sun is even fully up, and besides the unintelligible sounds from inside says that the other is on his way to the door. So Tsuna waits, even when seconds turn into a minute, feeling more guilty as the time passes but locked into his position by his thoughtless knock.
He's ready to apologize, has the words all ready on his lips when he hears footsteps approaching the door, the sound of the latch turning. He's just opening his mouth to speak, to offer embarrassed apology, when he looks up into not the face he was expecting and the thought dies into shocked silence.
"Tenth?" Gokudera blurts. His hand is still on the handle, his eyes so wide with shock Tsuna has the insane idea he somehow showed up at the wrong apartment by mistake. But Gokudera lives farther away, and in the opposite direction, there is no way even Tsuna could have mixed up the two locations.
"Gokudera?" Tsuna blinks, takes in the tangle of Gokudera's hair, the familiar logo on the same shirt he was wearing last night, the jeans collecting inches of extra fabric around his ankles. "What are you doing here?"
"Be right there!" Yamamoto's voice comes from farther inside the apartment. Tsuna looks out over Gokudera's shoulder, down the as-yet-unoccupied hallway, and suddenly an explanation presents itself to him, forms itself from the crimson blush spreading over Gokudera's face and the undeniable fact of Gokudera's presence here at Yamamoto's apartment.
"Oh," Tsuna blurts, and Gokudera takes a sharp inhale, like he's bracing himself to offer some kind of an explanation.
Then "Sorry, sorry!" and Yamamoto comes around the corner from the bedroom, pulling a pair of pajama pants up over his hips. "I couldn't find my jeans." He steps forward, no trace of embarrassment at Gokudera opening his door for him and no suggestion of more than pleased surprise at seeing Tsuna. "Yo, Tsuna!"
Tsuna just stares. Yamamoto is usually cheery, ready with a smile or a laugh in even the most dire of situations, but Tsuna's never seen him look like this before. He's glowing, a smile spreading out across his face like he's forgotten how to restrain the expression, his eyes drifting off Tsuna's face to cling to Gokudera's hair, going so soft Tsuna feels abruptly like he's intruding. He has a shirt on, actually looks more pulled-together than Gokudera himself, but when he lifts his head to look back up at Tsuna the sunlight catches off the tan of his skin, highlights a whole mess of bruised kiss-marks up against his shoulder, and one just against the pulse point at his neck with what looks like the imprint of teeth surrounding it.
"Oh my god," Tsuna says. "Did-are you two dating?"
Gokudera makes a strangled sound, not protest as much as a vocalization of the pure red on display all across his face, and Yamamoto laughs, bright delight warmer than anything Tsuna has ever heard from him before.
"I mean," Tsuna backtracks, looking away from the ridiculous softness in Yamamoto's face to Gokudera's blush. "Not that I mind." He offers the vest, belatedly, holds it out until Gokudera reaches out to take it from him. "Uhm. Congratulations?" That sounds too confused, undermines his sincere relief that Yamamoto and Gokudera have finally worked out whatever was between them. Unless- "Have you been dating?"
"No," Gokudera says, response so instant it sounds like a wail. "Not...before."
"Oh." Tsuna blinks again, looks from Gokudera's blush to Yamamoto's glow and back again. "Well. Congratulations, then." Self-consciousness runs up against surprise, the both spilling up his throat at once in an awkward laugh. "That actually explains a lot."
That brings Gokudera's head up. "What?"
Tsuna lifts his hands in defense, takes an involuntary step back. "I mean. Nevermind, just...I'm happy for you!"
"Wait," Gokudera says. "What do you mean?"
Yamamoto steps forward, his hand coming up to brush against Gokudera's shoulder, and Tsuna can see the other's attention fracture, his head coming up to stare at Yamamoto's face. For once there's no insult on Gokudera's lips, none of the shoving resistance this contact would have brought about even the night before; he just goes silent, staring at Yamamoto like all his thoughts have stalled silence while the other grins and ducks his head in Tsuna's direction.
"Thanks, Tsuna." His hand comes up, a wave at least as sheepish as it is appreciative. "We'll see you."
"Hey," Gokudera starts to protest, still staring at Yamamoto, but Tsuna knows to take an opportunity when he can. He's ducking out of sight, darting down the hall back to the main street before Gokudera can realize he's gone and come after him with demands for more explanation.
Apparently he missed more the night before than he thought. Still. With Yamamoto looking so blissful, and even Gokudera gone soft and warm under the flushed embarrassment of getting caught out, Tsuna can't muster anything but a grin as he makes his way back to wake someone who can bring him up to speed.
