Undertale x Reader Lemons

Not A Request, But I Wanted to Write This (Fell!Sans x Pet!Reader)

It had been a tiring day. Red wouldn't allow you to leave his side, he'd been especially clingy. Currently, you were on the couch, with Red to your left. He held your leash in his hand, occasionally looking in your direction.

~The Next Morning~ (Like 3:00 AM)

You needed to get out of here. You sat up in your dark, small room. Getting up completely, you listened closely. If you were correct, Red and Papyrus should still be asleep. Hesitantly, you headed up the stairs that lead to your door. You stopped, listening again to make sure that the brothers were still asleep. Once you were sure, you opened the door.

The house was dark, but you could still see. Carefully, you made your way to the front door. Once you did, however, you heard a dark voice in your ear. "Where do you think you're going, pet?" You tensed up, shaking slightly. 'No, no, no! Not him! Anyone but him!' You thought to yourself, debating whether or not you should turn around. In the end, you did.

"Trying to escape, are we?" You shook your head rapidly, attempting to speak, but no words came out. Even in the dark, you could see him smirk. "You've been naughty. Do you remember what happens naughty pets?" He asked, his sadistic side beginning to show. "They get punished." He said darkly, grabbing your wrist and teleporting to his bedroom.

There was a dim lighting, and the room was slightly cleaner than normal. You try to plead, but before you can even say anything, you're pinned to the wall with magic. Red is in front of you smirking devilishly. You were shaking with fear, tears threatening to come out of your eyes. "Now, now." He began, grabbing your leash. "You knew what you were doing, and you knew you were going to get punished. Don't act like you didn't see this coming, sweetheart."

You trembled more. What was he going to do to you? Your question, however, was soon answered. "Now, be a good girl and suck me off." He said, the lust in his eyes easy to see. You cocked your head to the side, confused. Sans smirked, before snapping again. The magic was released.

Before you could make a move, however, Sans forced you onto your knees. Now you understood. With one hand, he grabbed your hair. With the other, his dick. He forced your mouth open, shoving his dick inside. He bobbed your head back and forth before you began sucking on your own.

"You learn fast, pet." Red moaned. Wait... moaned? He was enjoying this?! Angry, you tried to force him out of your mouth. However, that backfired as he moaned louder. "Arrgh! I can't take it anymore!" He forced his entire length into your mouth, causing you to choke slightly. Your teary eyes widened in shock as he came inside of your mouth.

When Red did take his member out of your mouth, you attempted to spit his cum out. Key word attempted. When you tried, Sans put his hand over your mouth. "Swallow." He growled. You complied, not wanting to get hurt. When you stood up, Fell used his magic to pin you to the wall again. You gasped in shock. He laughed, grabbing your leash.

"You really thought that I was done? No, no. We've only just begun." He said, pulling you closer to him. Red kissed you roughly. He then licked your bottom lip, asking for entrance. When you denied this of him, you found out it was no request. He grabbed your ass, causing you to gasp. He took this as his chance as he shoved his tongue into your mouth.

You attempted to fight for dominance, but it was futile. Red won and searched the cavern that was your mouth. When he broke away, there was a string of red saliva connecting your mouths. Red made his way to your neck, biting, licking, and sucking on it. When he found your sweet spot, you had to bite your lip to keep from moaning.

Apparently, this was not the right response. Red bit down on your sweet spot, causing it to bleed. He licked the blood off of your neck in a very... sensual way. When he broke away from your neck, he licked the blood off of his fangs. Your blood. You saw Red smirk again, before walking over to his dresser.

He fumbled around in the drawer for a minute or so before coming back. When he did, you saw that he was holding a leather gag. Your eyes widened as you pleaded. "Red p-please! D-Don't do this!" He simply looked at you before putting the gag in your mouth. He had a sadistic look on his face. "Did you forget? It's master to you." He smirked. "I wasn't exactly planning on it before, but now I'm going to have to. Defiance and disrespect. That's two more punishments, sweetheart."

He looked you in the eyes. You could see the hunger and lust. He snapped, before looking down. When you followed his gaze, you had found out that he had taken your clothes off with a single snap. This made you whimper slightly, which seemed to only turn Red in even more. He took his own shirt off, revealing his ribcage. He then kissed you again, even rougher then last time. When he licked your bottom lip, you gave him entrance, as you didn't want a repeat of last time.

He broke the kiss, looking down to your chest. You quivered slightly, turning red from embarrassment. This made Red look you in the eyes again. "What did I say about defiance?!" You stopped shaking, which seemed to please him. He licked your collar bone, before making his way down to your breast.

He licked and sucked on it, occasionally biting. This brought you a feeling that you had never felt before... lust. Red's eyes look over your entire body, before landing on your entrance. Red gets onto his knees and spreads your legs. He licks up your right thigh, stopping at your clit. He then looks up at you, smirking.

Even though you had a gag in your mouth, you managed to stifle a small moan. "You like that, don't you?" You merely nodded in response. He then licks up your left thigh. "My, my. You're very wet, sweetheart. Such a sinner." He said, teasing you. He then licked your clit, causing a moan from you.

Red then shoved his tongue into your entrance, eating you out. You loved this new feeling. It was... indescribable. As he continued, you felt a knot in your stomach and you moaned loudly. (Well, as loud as you could.) Red instantly stopped, looking up at you. He got up and took the gag out if your mouth. "Beg for it." He said simply. Being the mess that you were, you did.

"M-Master, p-please!" He smirked, taking off his shorts and boxers to reveal his rock-hard cock. "What was that, doll?" He asked teasingly. "M-Master... p-please!" He looked you in the eyes and laughed. "As you wish." He said as he shoved his entire length into you. This caused you to moan loudly. He began thrusting. In, and out. In, and out. Unfortunately for you, this was unbearably slow.

"F-Faster~" You moaned. When he only quickened his pace slightly, you attempted to force him even deeper. This caused him to laugh. "Impatient, are we? You dirty girl." He said. Though he did go faster, pleasing you. He kissed you. It was a deep, passionate kiss. This lasted until you had to break away for air. You moaned again, feeling the knot in your stomach become more prominent.

Red quickened his pace even more. You moaned again, louder this time. When he caught on he began thrusting even deeper. "M-Master~!" You moaned as you came. Red, however, kept thrusting. "D-Damn sweetheart, you're tight!" Red moaned as he continued to thrust deeper and deeper. You were a moaning mess, loving the pleasure and lusting for more.

Red grabbed your leash. "Say my name and I'll give you a reward." He said. "M-Master~" You managed to say. "Louder." He moaned, thrusting harder. "M-MASTER~!" You moaned loudly. As you did, Red came. You moaned one last time before he pulled out of you. He released the magic holding you to the wall, picking you up and placing you onto his bed.

He laid next to you, grabbing you around the waist and spooning you. Soon enough, you fell asleep in his arms.