Chapter Text
6.
The silence in the Avengers Tower was usually a sign of a successful mission or a rare moment of peace. Today, it was the sound of a looming catastrophe.
It started with a sneeze. Then a cough. Then, the unthinkable happened: Senku Ishigami, the boy who claimed he could survive a stone-age apocalypse through sheer willpower, face-planted onto his workbench.
"Senku!" Peter scrambled forward, catching his friend before his head hit a rack of test tubes. "Tony! Bruce! Something’s wrong! He’s burning up!"
By the time Loki arrived, the lab was crowded. Bruce was scanning Senku with a medical pad, and Tony was pacing, looking at a readout of atmospheric contaminants.
"It’s not a normal flu," Bruce said, his brow furrowed. "The protein spikes in this virus are... vibrating. They're phasing in and out of the physical plane. It looks like a cross-contamination from that Asgardian residue we were analyzing yesterday."
Loki pushed through the crowd, his face pale. When he saw Senku—usually so sharp, so vibrant, now reduced to a shivering, pale heap in Peter’s arms—something inside the God of Mischief snapped. The air in the room didn't just get cold; it became brittle.
"Step away from him," Loki commanded. His voice wasn't the silk of a trickster; it was the iron of a King.
"Loki, we need to get him to the Med-Bay," Steve said gently, reaching out a hand.
"You will do no such thing," Loki hissed, stepping toward Peter and lifting Senku out of the teenager’s arms as if the boy weighed nothing. "Your mortal medicine is built for three-dimensional pathogens. This is a sickness of the soul and the ether. He is mine to tend."
Without another word, Loki vanished in a swirl of emerald smoke, taking the unconscious scientist with him.
The Sanctuary of the God
Loki reappeared in his private chambers, the most heavily warded room in the Tower. He laid Senku on a bed of enchanted furs and silk, his hands trembling as he brushed the sweat-soaked hair away from the boy’s forehead.
"Ten... billion... percent..." Senku muttered, his eyes fluttering but not opening. "Loki... the... entropy... the math... doesn't add up..."
"Shhh, little scholar," Loki whispered, his voice breaking. He sat on the edge of the bed, his palms glowing with a soft, golden-green light. He pressed his hands to Senku’s chest, trying to stabilize the boy’s flickering molecular structure. "Save your breath. The universe is not a sum you need to solve tonight."
For hours, Loki didn't move. He became a conduit, pouring his own divine essence into Senku to act as an anchor for the boy's cells. He watched every shallow breath, every shiver. It was a terrifying realization: the boy who mocked the gods was the only thing keeping this particular God grounded in reality.
The Delirious Realization
Around 3:00 AM, Senku’s fever spiked. He gripped Loki’s hand with surprising strength, his knuckles white.
"Loki," he croaked, his eyes snapping open. They were bloodshot and unfocused, but the intelligence was still there, burning behind the haze.
"I am here, Senku."
"The... the silk..." Senku gestured weakly to the bedding. "I calculated it... at the gala. It wasn't just... aesthetics. The weave... it’s a dampening field. You... you’ve been trying to... protect me... since the day we met."
Loki froze. Even in the throes of a magical fever, the boy was still deducing. "I don't know what you mean."
"Liar," Senku whispered, a ghost of his manic smirk appearing on his cracked lips. "You... you’re a high-energy anomaly... but your output... it’s always... directed... at my safety. Why? It’s... inefficient. It’s... illogical."
Loki leaned down, his forehead resting against Senku’s. "Because, you arrogant, brilliant child... if the world loses your mind, it becomes a place not worth ruling. You are the only thing in this realm that isn't a bore. Does that satisfy your 'logic'?"
Senku let out a jagged breath. He looked up at Loki, and for a fleeting second, the "oblivious" mask slipped entirely. He reached up, his fingers weakly tangling in the collar of Loki’s tunic.
"Ten billion percent... certain," Senku murmured, his voice fading as the healing magic finally took hold, "that you're... a terrible liar... and a very... good... heartbeat."
He fell back into a deep, natural sleep, his hand still anchored to Loki’s.
The Family Watch
Outside the heavy oak doors, the Avengers were gathered. Natasha had brought a tray of tea; Peter was sitting on the floor, leaning against the wall; and Tony was leaning against the opposite side, looking uncharacteristically somber.
"He's not coming out, is he?" Peter asked quietly.
"Not until Senku wakes up," Natasha replied. "I've never seen Loki like this. Not even with Thor. It’s like he’s finally found something he’s afraid to lose."
"He’s been in there for ten hours," Tony noted, checking his watch. "FRIDAY says the bio-signs are stabilizing. The kid’s going to be fine."
"He's more than fine," Steve said, a small smile on his face. "He’s got the most dangerous being in the building acting as his personal guardian. I don't think anyone's ever been safer."
Suddenly, the doors creaked open just an inch. Loki’s face appeared in the gap—he looked exhausted, his hair a mess, his eyes red-rimmed. But the predatory, protective glint was back.
"He requires... broth," Loki stated flatly. "And the blue liquid he calls 'Gatorade.' If any of you make a sound above a whisper within fifty feet of this room, I will banish you to a dimension consisting entirely of mid-level management seminars."
"We're on it, Reindeer Games," Tony saluted, actually looking relieved.
As the door shut, they heard Senku’s voice from inside, faint but definitely regaining its edge.
"Loki... why is there a glowing rock on my chest? If that’s a soul-stone, I’m going to need to measure its radioactive half-life immediately..."
"Go back to sleep, you insufferable mortal!"
"Only if you... tell me the chemical composition... of Asgardian broth..."
Loki’s exasperated groan echoed through the hallway, but through the crack in the door, Peter could see Loki tucking the blanket around Senku’s shoulders with a tenderness that could only be described as love.