A/N: I have no life and no excuse for not updating, sorry. Here's this cuz i feel like it
I KNOW SOME OF YOU READ THIS SHIT PLEASE REQUEST I NEED IDEAS
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Gaster's lab coat slipped off of him and fell to the floor, revealing his outfit beneath. He pulled anxiously at his black turtleneck, lifting it over his ribs.
You could see the massive bulge in his tan pants, practically too big for them. It looked REALLY hot- and the way it was glowing, the same way as his eye...
He threw his sweater off and stepped towards you again. He was obviously extremely horny; looking at you, head lifted, with only lust.
He was sexy. Not just regular sexy. SUPER sexy; god he was hot. It didn't hurt that you had a thing for monsters, too. His ribs lifted as he took another step. Your pants were starting to feel really tight.
Gaster ran his tongue over his teeth. The muscle was blackish-purple, like ultraviolet, the same color shining through every crack in his body.
He unbuckled his pants, and you watched as his cock sprung free. It was massive, longer and thicker than anything else you'd had. It throbbed, as a human's would, and you snapped out of your trance.
You leaned forward, taking his length in your hand. It was hard and warm, and you could feel the precum emerging from it as you ran your hand over the tip.
You took a moment to just admire the girth of the thing. It had to be at least 10 inches long crisscrossed with veins even though he didn't need them.
You ran a hand up his leg, massaging it then taking a firm hold to steady yourself as you began to suck him off.
He tasted incredible. There was something about it you couldn't put your finger on. Maybe it was magic. It didn't matter. The more you tasted, the more you wanted.
Gaster grabbed ahold of your head with one hand, moaning as you began to deepthroat him. Your vision was getting hazy; god he tasted amazing. As good as it was to taste him, you needed more.
You slipped his throbbing cock out of your mouth, putting your hand behind his leg, and pushed him to the ground. Before he could react, you had positioned yourself on top of him.
You took no hesitation in burying his thick length inside yourself. It was amazing, incredible; it was all you'd ever lived for. Your sole purpose, to be this man's cum dumpster to please him and be filled by him.
"gah- uhn!" Gaster cried as you pushed him even deeper inside you. He'd never felt stimulation on this part of his dick before; he'd never met anyone who could take this much.
You were determined to fit more of him. You needed to make sure that when he came in you- he WOULD cum in you- that you kept every last drop of his seed.
You could feel his thick cock throbbing inside of you. He was getting close. It was a shame it had to end so soon, but you were equally as excited for the release, the climax, your purpose fulfilled.
Gaster roared. It was a sound you'd never heard before, of utter and complete primal lust as he thrusted his body upwards. Immediately you felt the rush of orgasm.
His seed rushed inside you, flooding every corner of your insides. His load was enormous, he had been pent up for so long; not even the thickness of his cock could keep all of it inside you.
The liquid seeped out of your hole and spilled onto the both of you, some spilling onto the floor. You were both panting, feeling your body return to your control after the instinctive final thrusts.
You didn't move. The effects of his magic had mostly worn away, but you were still horny and Gaster filled you up so well. You felt warm inside, probably from the heat of his cum.
YOU ARE READING
~Lusting~ Undertale X Reader Oneshots
Fanfic!!! Does contain explicit content !!! A collection of Undertale oneshots. Feel free to request on the request page. Can be angst, Fem!reader, Male!reader, smut, fluff...
