featuring: light yagami x fem!reader
warnings: canon-typical themes of deception, light’s ulterior motive, nsfw (virginity loss, fingering, voyeurism (unaware on reader's side), soft dom!light, praise / body worship, protected PIV sex, aftercare and gentle tone are present but with hidden motives)
synopsis: what started as innocent math tutoring at light yagami’s house turns into your first time, unaware that hidden surveillance cameras are capturing every moment, realizing just how far light is willing to go to protect his kira facade.
masterlist link: summer challenge 2025
tags: @carrotheadedtoast @steponupbabe @breakmeoff (as always, dm me or leave a comment if you’d like to be tagged for the rest of this project)
an: ninth day of the challenge, i've been needing to write a death note fic since i got into death note when i was younger. hope you enjoy this one!!!
"Thanks for helping me, Light," you smiled, smoothing the hem of your skirt as you sat cross-legged on the edge of his bed. Textbooks were scattered in a neat chaos, and your open notebook sat on your lap, filled with scribbled fractions and highlighted formulas. “I swear, algebra is going to kill me before midterms do,” you muttered, scribbling down another wrong answer.
Light Yagami gave you that practiced smile, the one that made your stomach flip and your pulse skip. "Of course," he said. "I'd do anything for you."
“Besides, you’re smarter than you think,” he said, reaching over to nudge your pencil away from the mess of equations. “You just need someone to break it down… slowly.”
You snorted. “Are you flirting with me or tutoring me?”
“Why not both?” He reached over to tug gently at your skirt, his hand brushing your thigh as he leaned in, just barely. “Besides, it’s not like you mind the distraction.”
Your breath caught slightly, nerves curling in your stomach, but you didn’t move away. When he finally kissed you, it was soft, teasing at first. Just lips and warmth. Then it deepened quickly. Your fingers clutched at his shirt, pulling him closer, surrendering to the way his mouth moved against yours with practiced ease. Somewhere in the tangle of tongues and breathy moans, Light’s hand slipped beneath your skirt. You gasped into his mouth, tensing, but not pulling away.
Light pulled back slightly, his lips barely brushing yours. “Hey,” he whispered, “I’ll stop if you want me to.”
Your voice was small. “I’ve never...”
He kissed the corner of your mouth. “I know.” His hand moved gently over your clothed core, the heat of him almost unbearable. “Can I show you how good it can feel?” he asked, voice silky. “Just with my fingers.”
You nodded, and Light smiled, kissing you again as he found the edge of your panties, sliding his fingers down your slit. Your panties were soaked before he even slipped beneath them. His finger rubbed slow circles over your clit, making you gasp softly into his mouth. It was strange at first, unfamiliar—too much and not enough. But he was patient. Focused. When he finally pushed a finger inside, your breath hitched.
“Have you ever touched yourself like this?” he asked gently, pressing a kiss to your neck.
“N-No,” you breathed. “Not really…”
He smiled into your skin. “I can tell.”
You whimpered when he rubbed slow, careful circles against your clit, your hips jolting. The sensation was strange, too much and not enough all at once, but his voice grounded you. His praise was laced with adoration, not mockery.
“You’re so beautiful like this, baby. Every little sound you make? Perfect.” He slid a finger into you slowly—painstakingly gentle—and you whimpered, clenching around him. It didn’t hurt, but it felt unfamiliar, strange.
Light curled his finger deliberately. Finally, He found the spot that made you jolt and honed in on it, coaxing your body to bloom open around him. You moaned quietly, the pleasure building in your belly, deeper than anything you’d felt before.
“There,” he whispered, kissing your cheek. “Right there, yeah?”
Your eyes fluttered shut as he found a rhythm, your thighs shaking just a little, the heat building in your belly too fast to make sense of. “Let go for me, sweetheart,” he cooed. “I’ve got you. Just let it happen.”
You came with a soft cry, gasping against his chest as your body trembled. He didn’t stop until you pushed lightly at his wrist, overwhelmed. “You’re incredible,” he murmured, stroking your cheek. “I want to make love to you.”
You blinked, still flushed. “You... do?”
“I want to take care of you. Properly.”
You hesitated. “Will it… hurt?”
“I’ll be slow,” he promised. “We’ll go at your pace.”
He reached into his wallet, pulled out a condom—already prepared, already planned—and slid it onto his length while you watched, wide-eyed. He undressed only what was needed, guiding you onto your back, pulling your panties down your thighs, and tossing them gently onto the edge of his bed.
“Still sure?” he asked gently, rolling the condom on.
Light kissed you again, then carefully tugged your panties off and positioned himself over you, lining up. “Hold onto me,” he whispered. “It might sting a little, but I’ve got you.”
He eased in slowly, stopping every inch to kiss you, to breathe with you, to let you adjust. “It’s okay,” he whispered, stilling when he was fully inside. “Just breathe. You’re doing so well.”
It took a moment for your body to adjust, but when he began to move—slow and careful—it sparked something inside you again. Your fingers gripped the sheets, your lips pressed to his, moaning into his mouth as he moved deeper, smoother.
“You feel so good… God, you’re perfect inside. Taking me so well. Look at you…”
He moved slowly at first, then a little faster, careful never to push you too far. He kissed your lips, your neck, whispered how proud he was, how beautiful you looked taking him for the first time.
“Light..” you softly moaned, your thighs twitching around his waist. You could feel that warm feeling in your body beginning to build up, unlike when he fingered you, it was a little more intense feeling.
“You gonna cum?” He asked, hooking his right arm under your thigh, introducing a new angle that had you seeing stars. “Come on then, you can do it.”
Your second orgasm was softer, but no less intense. When you came again, he held you through it, following just moments after, stifling a groan in the crook of your neck as his hips stilled. The feeling of his hot cum filling up the condom made your thighs twitch a bit before he pulled out, tossing the condom into his trash.
You lay beneath him, breathless, dazed, and glowing. Light kissed you softly, then reached over, tucking your panties into the drawer of his nightstand with a little smirk.
You raised a brow. “What was that for?”
“A souvenir,” he said playfully, brushing your hair from your forehead. “Only mine.”
Meanwhile, across town, at the Task Force Headquarters… The room was dead silent. L sat motionless, a sugar cube halfway to his mouth. Soichiro Yagami was frozen beside him, face red with both shock and something resembling horror.
After a long, painful pause, L finally spoke. “…Guess your son’s quite the romancer.”
Soichiro choked on his tea.
