Chapter Text
8.
Three months into the "Ishigami-Loki Partnership" (as Senku called it) or the "Grand Divine Courtship" (as Loki insisted on calling it), Avengers Tower had undergone a radical structural transformation. The penthouse was no longer just a luxury lounge; it was the headquarters for the newly dubbed "Department of Extra-Dimensional Chemistry."
The Avengers had mostly adapted. They had learned that if the kitchen smelled like sulfur, Senku was working; if it smelled like ozone and expensive cologne, Loki was "helping."
One crisp autumn afternoon, the team gathered in the common area, watching a scene that had become their new normal.
Senku was sitting at the breakfast bar, surrounded by a holographic map of the Yggdrasil tree that Tony had helped him render. He was currently eating a bowl of instant ramen while simultaneously marking "inefficient energy nodes" in the cosmic bridge.
Loki was standing behind him, his hands resting possessively on Senku's shoulders. The silver stabilizer cuff gleamed on his wrist, and he looked more relaxed than the Avengers had ever seen him—though no less sharp. He was currently using a small flick of his fingers to keep Senku’s tea at a perfect 85∘C.
"You realize," Tony said, leaning over the back of the sofa with a smirk, "that if you two keep optimizing the Bifrost, Thor is going to be out of a job. He likes the bumpy ride. He says it builds character."
"Thor’s 'character' is a statistical outlier based on blunt force trauma," Senku said without looking up from his map. "The Bifrost is bleeding dark matter at a rate of three liters per jump. It’s a tragedy of engineering. I’m just tidying up the universe's messy math."
"He’s doing a marvelous job, Stark," Loki purred, leaning down to press a chaste, lingering kiss to the top of Senku’s messy green-and-white hair. "The All-Father is quite perplexed. He received a report from the Gatekeeper that the rainbow bridge now 'hums in B-flat' and is 40% faster. He doesn't know whether to give Senku a medal or a restraining order."
"Ten billion percent go with the medal," Senku muttered, finally putting his chopsticks down. "I need more Uru metal for the new battery project."
The Family Dynamic
Peter Parker walked in, dropping his school bag by the door. "Hey guys! Senku, MJ wants to know if you're coming to the Decathlon practice tomorrow. She says if you don't show up to help with the chemistry section, she’s going to tell everyone your hair is actually a highly evolved species of moss."
Senku snorted. "Tell the scary girl I’ll be there. But only if she admits that my moss is more intelligent than the entire Midtown faculty."
Loki’s eyes narrowed slightly, his grip on Senku’s shoulders tightening just a fraction. "And who is this 'MJ'? Does she require a formal demonstration of why one does not threaten the consort of a Prince?"
"Easy, Tiger," Natasha said, walking past with a smirk. "She’s a teenager. And she’s arguably the only person Senku is actually afraid of."
"I'm not afraid of her," Senku defended, his face heating up. "She just... has a very efficient way of dismantling my arguments using social psychology. It’s annoying."
Loki chuckled, the sound low and rich. He turned Senku’s chair around so they were eye-to-eye. "It is a rare gift to find a mortal who can challenge you, my heart. But do try to return home in one piece. I have plans for the evening that do not involve 'Decathlons'."
"Oh? More lab work?" Senku asked, his eyes sparkling with that familiar manic curiosity.
"No," Loki whispered, his voice for Senku’s ears only. "I found a pocket of the Vanir realm where the flora reacts to human touch by emitting a soft, bioluminescent glow. I thought we might... study the biological trigger. Together."
Senku paused, his analytical brain processing the "date" invitation. He knew Loki was being romantic. He knew the "study" was just an excuse to get him alone under a canopy of glowing alien trees.
He also knew that he didn't care.
"Fine," Senku said, reaching up to tug on Loki’s emerald tie, pulling the God down for a quick, firm kiss that left the Avengers cheering and whistling in the background. "But I’m bringing a spectrometer. If those plants are emitting light, I want to know the exact wavelength."
"I would expect nothing less," Loki sighed, looking utterly smitten.
The Kingdom of Science and Magic
As the sun began to set over New York, casting long shadows across the Tower, Tony watched the two of them—the scientist and the god—leaning over a tablet, arguing about the refractive index of Asgardian flora.
"You know," Tony said to Steve, "I thought having one genius in the house was a headache. But this? This is something else."
"It's a balance, Tony," Steve replied, leaning against the window. "Loki gives him the world, and Senku gives Loki a reason to stay in it. I’d say the science checks out."
In the center of the room, Senku laughed at something Loki said, a genuine, bright sound that had nothing to do with formulas and everything to do with the man holding him.
The God of Mischief and the Boy of Science. It was the most illogical, improbable, and high-energy reaction in the history of the universe.
And according to Senku Ishigami, it was ten billion percent perfect.