Chapter Text
7.
Recovery for Senku Ishigami did not involve "rest" in the traditional sense. Within forty-eight hours of his fever breaking, he had converted Loki’s regal guest chambers into a satellite laboratory. He was sitting cross-legged on the floor, surrounded by piles of Stark-tech components, ancient Norse scrolls he’d "borrowed" from the library, and several empty bottles of blue Gatorade.
Loki sat on the edge of the bed, watching the boy with a mixture of awe and exasperation. The God of Mischief had barely slept, his protective instincts still humming like a live wire, but Senku was already back to his usual frantic pace.
"You are supposed to be convalescing," Loki remarked, though there was no bite in his voice. "Not dismantling a Mark 85 repulsor assembly."
"Rest is a waste of metabolic energy once the white blood cell count has stabilized," Senku said, his tongue poking out of the corner of his mouth as he soldered a wire with surgical precision. "Besides, I owe you a 'thank you' for the magical antibiotics. And in the Kingdom of Science, we don't pay our debts with words. We pay with results."
Loki leaned back, a smirk playing on his lips. "And what 'result' could a mortal possibly provide for a God who has seen the birth of stars?"
Senku stopped. He looked up, his red eyes sharp and uncharacteristically serious. "You’re always talking about how your magic is separate from the world. How it’s 'chaos' or 'starlight.' But ten billion percent, you’re wrong. You’re just a different kind of energy, Loki. And energy... can be focused."
He stood up, his legs slightly wobbly but his hands steady, and walked over to Loki. He was holding a small, silver cuff. It looked simple, but as Loki looked closer, he saw millions of microscopic etchings on the surface—mathematical proofs intertwined with Asgardian runes.
"I noticed something while I was sick," Senku said, his voice dropping. "When you were anchoring my cells, you were losing a lot of energy to the atmosphere. It was inefficient. Your power is raw, but it leaks." He took Loki's hand—boldly, without asking—and slid the cuff onto his wrist. "This is a stabilizer. It uses a feedback loop of your own frequency to minimize entropy. It’ll make your illusions solid without the mental drain."
The Calibration of the Heart
Loki felt it instantly. The constant, buzzing hum of his own magic, which usually felt like a restless sea, suddenly became a calm, focused river. It was the most comfortable he had felt in centuries.
But it wasn't the device that made his breath catch. It was the fact that Senku had spent his recovery time studying the intimate, vibrational frequency of Loki’s very soul just to make him "comfortable."
"You... you built this for me," Loki whispered.
"It’s just logic," Senku said, though his ears were turning a suspicious shade of pink. "If my lab assistant is constantly drained from over-extending his 'divine' output, my experiments suffer. I’m just protecting my investment."
Loki stood up, closing the distance between them. He was much taller, forcing Senku to look up, but the power dynamic had shifted. The God was no longer the hunter; he was the captivated.
"Is that all this is, Senku?" Loki asked, his voice low and dangerous. "An investment? Or is there a variable in your equations that you are too afraid to name?"
Senku didn't look away. He had realized Loki's feelings at the gala, but standing here now, in the quiet of the room, the data was overwhelming. The way Loki looked at him wasn't about "utility" or "efficiency." It was a total, catastrophic collapse of professional distance.
"I'm not afraid of any variable," Senku challenged, his heart hammering against his ribs—a biological reaction he decided to stop ignoring. "I just like to be ten billion percent sure of the data before I publish the results."
"Then let me provide the final proof," Loki murmured.
He didn't use magic. He didn't use an illusion. He simply reached out and cupped Senku's face, his thumb tracing the small stone-scar under the boy's eye. Slowly, giving Senku every chance to back away, he leaned down and pressed his forehead against the scientist's.
"I love you," Loki whispered, the words sounding like a confession and a threat all at once. "I have traversed the Nine Realms and found nothing as fascinating, as maddening, or as precious as you. Science be damned, Senku. I am yours."
The Results
Senku was silent for a long beat. His brain was trying to categorize the sensation of Loki's skin against his, the smell of ozone and old books, and the sheer irrationality of a God loving a mortal.
Then, he reached up and grabbed the lapels of Loki's tunic, pulling him down the last few inches.
"Took you long enough to find the answer," Senku muttered against his lips.
The kiss was everything Senku's science couldn't explain—a surge of dopamine, oxytocin, and something else that felt like a permanent chemical bond. It was messy and desperate and perfectly illogical.
When they finally pulled apart, Senku looked dazed, his hair even more chaotic than usual. He cleared his throat, trying to regain his clinical composure and failing miserably.
"Well," Senku said, his voice a bit shaky. "The... the biological compatibility is... surprisingly high."
Loki laughed—a genuine, joyous sound that echoed through the Tower. "High? Is that your version of a romantic declaration?"
"It's better," Senku smirked, his eyes shining with a new kind of fire. "It means the experiment is a success. And since a good scientist never leaves a successful experiment... I guess you're stuck with me, you big-headed oaf."
The Family Reaction
Outside in the hallway, the Avengers were once again "not eavesdropping."
"Did he just use the word 'experiment' as a wedding proposal?" Tony whispered, leaning against the doorframe.
"In Senku-speak? That was basically 'I do,'" Peter whispered back, grinning widely.
"Look at the bright side," Natasha said, tucking her arms across her chest. "Loki's finally found someone who can talk him out of world domination by explaining the molecular weight of the atmosphere. The world is a lot safer today."
"And a lot louder," Clint added, as the sound of Senku shouting about "Asgardian chemistry" and Loki’s indignant laughter filled the room.
Loki pulled Senku back into another kiss, the silver cuff on his wrist glowing with a steady, peaceful light. For the first time in his long, chaotic life, the God of Mischief didn't want to change the world. He just wanted to study it—specifically the part of it that was currently trying to explain the physics of a kiss while breathless.
"Ten billion percent," Senku whispered against Loki's neck.
"Ten billion percent," the God replied.