Undertale AU X Reader Oneshots

Nightmare Sans x Reader Lemon

(Fair warning, this isn't my first lemon, but it most defiantly is one. Read at your own risk.)

Y/N POV:

You've had a long day of cleaning, and yet still barely only half of it was finished. You look around at the huge castle you live within, the gothic style, and dimly lit hallways. It felt like a scene from a horror movie, as you passed each of the rooms you'd already cleaned, a sense of foreboding washed over you. You were on edge, however you couldn't quite identify the cause, maybe Nightmare was planning on playing some sort of sick joke on you again. The thought of the tar covered skeleton now filled your mind, and for some reason, you couldn't help but blush.

You thought of how his very presence within a room would guarantee all eyes on him, and him alone, how his voice rumbled through your chest every time he spoke to you. How he'd lean in close with that sadistic grin that his face always seemed to carry, and of course, his eyelight. In your opinion, that was by far the most striking of his appearance, the cold glare that it always held, the shiver that crawled up your body on the occasions that glare would land on you. You fantasized about what it may be like if he saw you the way you saw him. Yep, that's right, you, one of the many servants that lived within this castle, had a crush on Nightmare. It had always felt like the two of you had a special connection, after all, you had been the sole survivor of his attack on Dreamtale, your home au. Hell, he even took you with him in when he left, so thinking that he may have a soft spot for you couldn't be too farfetched, right?

You hummed to yourself in satisfaction once you finished all your chores, smiling to yourself, putting all your cleaning supplies away, before walking to your room. Though, you were only now realizing just how early you'd finished all your chores, and how oddly quiet the castle had been. You stopped in your tracks, realizing you were next to Nightmare's door, you looked over the wooden surface, reaching a hand out, grazing your fingertips over the platinum doorknob. You'd only ever been in Nightmare's room a couple of times, granted, that was back when it was only the two of you in the castle, he ad you clean his room due to the lack of other staff. Though, you never saw anyone but him enter the room now, you wondered who cleaned it, maybe... you could just have a peek inside? It was only you here anyways, what harm could it do?

You took I a deep breath, gripping the handle and gingerly turning it, peeking inside, darkness was all that met your E/C eyes. You huffed to yourself in disappointment, your hand feeling the wall for a light switch. But that's when you stooped, cold dread gripping you like a claw, what if Nightmare was in the room? You wouldn't have been able to see him, considering that the lighting in the room would effectively act as camouflage for him. You swallowed, taking your hand out of the room, before shutting the door and backing away. Before scurrying off to your room, though, once you opened the door, you stopped. Right there, sitting on your bed, was Nightmare himself. He raised his head once you entered, his smile growing as that piercing blue eyelight shrank in his socket. 'Well, look who finally decided to show up." You felt a familiar shudder creep up your spine as he spoke. You swallowed, choosing your next words carefully. "My apologies, Nightmare, I wasn't aware you were expecting me." You murmur, the skeleton in front of you only smirks. "How odd then, you know, normally when you snoop in a person's room, especially my room, I would assume part of you expected my visit." He purred. You felt your stomach do a few flips, as you stared wide-eyed at Nightmare, cursing yourself for ever giving into your curiosity. A deep chuckle rumbled from Nightmare's chest. "Alright, close the door behind you. Then I'd suggest taking a shower, I'll be waiting right here for you." He chuckled, you knew his sickly sweet tone meant nothing good for you. As you walked to your bathroom to change, only to be stopped by Nightmare. "Where do you think you're going?"

"T-To take a shower like you asked, Nightmare."

"Oh? And do you plan to shower in your clothes?"

"N-No, Nightmare, I planned to take my clothes off in the bathroom."