Leonardo wakes up when they get home. His hand tightens on Raph's arm as Raph lowers him into a bed in the infirmary, and his eyes open in two narrow slivers. A second later, Donnie appears at Raph's elbow as if plucked from thin air. He always swears that Leo's lying about their 'twin telepathy thing' but Raph's not buying it.
"Hi, Leon," Donnie says. "Feeling okay?"
"Okay," their younger brother mumbles agreeably. He blinks, so slowly it looks like he's going right back to sleep, then adds, "Had a weird dream."
"You've had a pretty weird day," Raph tells him gently.
"Try a weird life," Donatello says.
He's able to coax Leo through a quick check-up. Leo's answers are mostly word salad, muffled against the pillow, but by the end of it, Donnie looks like a hundred pounds was lifted off his shoulders. He's smiling, as if he can finally believe that they won now.
His relief speaks volumes. That's how Raph knows Leo's going to be just fine.
"Hey, what the hell, Donald!" Mikey screeches from the doorway, clutching the bottled waters he'd been sent away for. "He woke up and you didn't tell me? You should've pulled the fire alarm or something!"
"Oh, good, this is exactly what I want to deal with," Donnie mutters, rolling his chair away from Leo's bed to make way for the Mikey-sized bullet train that crashes into the spot he'd been sitting in one second ago.
April and Casey clamor in on either side of Mikey while Raph hovers to make sure no one forgets that Leonardo is actually not in any shape to be jumped on or tackled, even if that is usually how they show their love.
Leo, for all that he's still only half-awake, has no problem being the center of attention. He grumbles until Raph allows very (very!) careful hugs, and then scoots over to let Mikey clamber into the bed beside him, while April outlines her detailed scheme to steal the projector from the family room and set it up there in the infirmary instead.
The rest of them are being so noisy, Raph almost misses it when Leo says, "Casey?"
The boy in question, silent up until that moment, leans in with round eyes. "I'm here, sensei."
"Good," Leo replies, satisfied.
Casey blinks, and then smiles, and sits on the edge of the bed like he's certain of his place in the room. In true Leonardo fashion, it only took him one word to convince their newly adopted sibling of the same thing the rest of them have been saying all night:
Welcome home.