Pairing: Heimerdinger x Female!Reader Warnings: Mild danger, lab explosion (off-screen), emotional vulnerability Word Count: ~950 Summary: A lab accident brings you and Heimerdinger together under emergency lights. You support him as he calms you. Camaraderie grows intimate.

The explosion rocks the east wing, and you're the first one there — running, breathless, through smoke and glowing shards of broken Hextech.

Heimerdinger’s already working to contain it. His hands are steady, but his eyes flick to you the moment you arrive.

“Are you hurt?” he asks — not as a professor. Not even as a scientist.

Just someone who cares.

You work side by side, fusing runes, stabilizing energy, recalibrating the array. He guides you without condescension. You trust him without hesitation.

Later, when the alarms stop and the lab falls silent again, your knees give out — all the adrenaline crashing at once.

He catches you.

And for the first time, you let him.

He doesn’t speak at first. Just rests a gloved hand on yours, comforting without pressure.

“You were brilliant tonight,” he whispers. “Truly.”

And when you smile — tired, soot-streaked, and still trembling — he leans in just enough to press his forehead to yours.

Gratitude. Relief. Something warmer.

Neither of you names it.

But you both feel it.

Pairing: Heimerdinger x Female!Reader (slow burn / affectionate mentorship) Warnings: Mentor-student boundaries (platonic, implied eventual romantic), age gap (handled gently) Word Count: ~900 Summary: In Piltover’s academy, you assist Heimerdinger in a groundbreaking invention. Endearing mentorship evolves into fond camaraderie. Respect blossoms into affection.

He never calls you by your first name at first — just “Assistant” or “You there!” when his goggles slip too low and he needs another tool.

But over time, the titles soften. “You’re not just my apprentice,” he says one night, staring thoughtfully at your notes. “You’re brilliant. You remind me of… well, of me.”

His compliments are always technical. Methodical. But you notice when he brings you tea in your favorite cup, or adds a little umbrella to your drink after a long day.

You start staying later. Not because he asks — but because you want to.

He never rushes your bond. But one day, he looks at you like you’re more than an assistant.

And maybe he’s more than a mentor, too.