Pulling My Heartstrings (Undertale Au Smut)

Killer x Reader

"Killer~" I moaned softly, the soft vibrating in my lower regions driving me crazy as it wasn't enough to push me over the edge.

He just grinned and glanced back at me, "What? I thought you said you liked the torture?~"

"P..please?" I whined, still curled on the bed—as I was trusted not to touch myself without permission—and gave him a begging look. "Kills~ I need you, pleaseeee~"

He turned back around with a grin, "Fine.. but we're doing this until IM satisfied" He stated, turning the intensity up a bit.

I couldn't help the small scream that escaped me, the sudden intensity shocking me after so long of nothing but a dull humming.

He came back with a blindfold and gag, tying the gag securely before putting the blindfold on.

"Just lay there and take it.." he purred, the vibration going higher and making me let out a strangled moan.

My mind was fuzzy, a haze settling over everything, the pleasure overwhelming my senses and pushing away any thought that wasn't about him and what he was doing to me.

"You look so hot like this.. I want to keep you like this forever" He hummed, running his fingers through my hair.

I leaned into his touch, whimpering softly as he pulled away and left me feeling alone.

"Killlllsss~" I whined, the gag muffling my voice a bit.

He chuckled, "Be a good girl and I might consider taking the gag off~"

I whined louder and bucked my hips up, wanting him to do more, wanting more from him.

I could feel him moving, the vibrator turning off as he started removing the toy from me.

I squirmed, gasping and moaning as the vibrations stopped.

He gently stroked my leg, "Stay still baby.. or I'm not gonna do anything" He whispered, the gentle threat making me shudder.

I forced myself to stay still, biting my lip and squeezing my eyes shut under the blindfold.

"Good girl" he whispered, leaning forward to kiss my cheek.

I could hear a cap open, a moment later a slick finger being pressed against my ass.

I relaxed, letting him slide the digit in easily, moaning softly as he started thrusting his finger in and out.

I moaned louder when he added another, my legs starting to shake from the pleasure.

"Mm.. you sound so hot baby" He murmured, curling his fingers inside me and making me arch off the bed and cry out.

He kept hitting that spot, adding a third finger and making me see stars behind my blindfold.

"Pl...please.." I gasped out, the gag still firmly in my mouth. "Kill..." I couldnt even form the full name, too lost in pleasure to make any coherent words.

He just hummed and slid his fingers out, grabbing my hip with a soft grip and holding me down.

"Just relax" He said, slowly pressing into me and making me cry out loudly.

It was a mixture of pleasure and pain, and I could feel a few tears slip past the blindfold.

"Oh god you're so tight.." He groaned, slowly sliding in until he was completely inside me.

He stayed still, letting me adjust to the sensation before he moved, giving slow shallow thrusts.

I whimpered and moaned, wrapping my legs around his waist and urging him to move faster.

"Fu..fuck.." He growled, pulling almost all the way out and slamming back in, making me scream his name and claw at the sheets.

"Killer.." I moaned, the pleasure overwhelming as he started a quick pace.

"God.. you feel so fucking good" He growled, gripping my hips tightly as he thrusts harder.

I arched my back and clawed at the sheets, letting out a loud moan as he hit that sweet spot.

"Kills!" I screamed, "Right there! Fuckkk.." I moaned, the pleasure fogging up my brain and making my vision go blurry.

He just grinned, angling his thrusts to hit that spot every time, his hand reaching between us to rub my clit.

I couldn't last much longer, my climax rapidly approaching as he continued to fuck me hard.

"K...Killer!!" I screamed, my back arching off the bed as my climax hit, a rush of white-hot pleasure coursing through my body.

He continued his thrusts, chasing his own, his thrusts getting sloppy as he got closer.

"Fuck...! (Y/N)!!" He groaned, his grip on my hips tightening as he slammed into me one last time and reached his own orgasm.

We both were panting hard, Killer resting his forehead on my chest as he came down from his high.

I let out a small squeak as he pulled out, the sudden empty feeling making me whimper.

"Shh.." He whispered, reaching up to untie the blindfold and take off the gag.

He tossed the cloth aside and kissed my neck, "Are you alright?" He asked, sounding genuine with his care.

I nodded, "Yea...just sore.." I mumbled, relaxing into the soft sheets.

He smiled and pulled the covers over us, cuddling close to me. "Get some sleep, you've had a long day" He hummed, kissing my cheek softly.

"Goodnight killer" I yawned, closing my eyes and drifting off into a peaceful sleep.