Undertale AU Sans x Reader Oneshots

Nightmare x Innocent! Reader (Lemon)

THIS IS A LEMON!!! I REPEAT THIS IS A LEMON!!! INNOCENT CINNAMON ROLLS OR PEOPLE THAT DON'T LIKE LEMONS WAIT FOR THE NEXT CHAPTER!!! I hope you enjoy!

(Y/N) POV
"Hey Dream! Do you want to play tag!" I shouted. "Sure!" I maybe an adult but I am still a kid on the inside. Me and Dream started to play tag. We enjoyed ourselves I just wished Nightmare would join every time I hang out with Dream.

Nightmare's POV
I watched as (Y/N) and Dream were playing tag in the patch of flowers. It bugs me to see (Y/N) and Dream together. I really love (Y/N) but she probably wouldn't love someone like me. Besides I have tentacles, and I'm covered in goo. I was getting even more pissed off when they laid on the flowers while holding hands. Nope fuck this shit I'm out. (Alright then~).

(Y/N) POV
Me and Dream collapse on the ground. Our hands touched since we are best friends. "Hey Dream when are you and Cross going to get together?" I looked at him. He started to blush a golden hue. "I-I don't know." I smile. "I think you two would make such a cute couple." (And they are!) I smile. He blushes even more. I giggle. Then a portal pops out and in comes in Ink. "Hey Dream. You forgot me you and Blueberry would hang out today." Ink states. "Oh I'm sorry." Dream gets up. "It's alright." Ink smiles. I get up and hug Ink. "Hey there Ink." I smile and look at him. "Hey (Y/N)." He hugs back. "Say hi to Blueberry for me." I let go. "I will. Bye (Y/N)." Ink goes through the portal. "Bye bestie." He waves. "Bye bestie." I repeat. (Awaken!) He leaves and I lay down on the flowers once again. "It's so pretty here." I relax my body and feel the gentle breeze whoosh by me. Then I get up. "I'm going to bed." I walk into Nightmare's castle. I stay with him and Dream but Dream has his own house. At least Nightmare stopped fighting Dream and the other Sanses.

I walk into my bedroom close the door and change into a (F/C) tank top with matching shorts. I then flop on my bed. I close my eyes and drift off to sleep.

Nightmare's POV
It has been 5 hours since (Y/N) went to bed. I can't just stop thinking about her. But I also can't stop thinking about Dream holding (Y/N)'s hand. BOOM!!! "Change in weather huh." I mumble to myself. *knock knock*. I groan. I didn't want to get out of bed. (Tell me about it). I get up and walk to my door. I open it to see (Y/N) in a (F/C) tank top and matching shorts. She honestly looks very sexy. She looked at me with a startled look. "What's wrong?" I ask her. "I don't like thunder storms. It brings me bad vibes." Someone has been watching too many scary movies. "Can I stay with you? I feel safe when I'm around you." I started to blush. She feels safe around me?! "S-Sure." I step aside to let (Y/N) come in. She walks in and I close the door. She then runs to my bed. "Your bed is very soft." She melts into the touch of my bed. I chuckle and sit by the side of the bed. It is a good thing my goop doesn't stain the bed. "Aren't you going to lay down?" She sits up and scoots over to me. I start to blush even more. "Uh..." I look away from her. "Nightmare?" She touches my gooey shoulder. My face was was now a blueberry by now. (Not you too Blueberry?!) "You have been avoiding me lately. Is there something bothering you?" I turn  my head to face her. I my blush dies down but not fully. "It is because you keep hanging around with Dream and not me. I was always jealous of him that everyone loved him and not me. Then you came into the picture. I then started to like you a lot. Before I knew it....I have a crush on you. You were the first person to hang out with me even though I look like this. Then you became friends with my brother. You started to become really close. I got jealous again because you were.....hanging out with him and not....me."

(Y/N) POV
I started to blush. Not a lot but it is visible. He was also blushing. "I honestly didn't know you liked me in that way. I also have a crush on you too Nightmare." I give him a closed eye smile. I then open my eyes to see Nightmare's face all blue. "Y-You do?" I laugh awkwardly. "Yeah." He then hugs me. I felt so loved since his tentacles were also hugging me. He then breaks the hug and kisses me. I was surprised. I then kiss back. I then felt something slimey lick my bottom lip. I was very confused and open my mouth awkwardly since I don't know what I'm doing. I then felt him suck my tongue. He has a tongue?! He explores my mouth. He then breaks the kiss.