US sans x reader lemon

How'd he know?!?!

You three were holding hands, smiling thinking about how you'll be a family together. Monsters stare at you in a weird way, like they've seen you three do something crazy. The three of you just shrugged & just got to where Undyne's lab is. Sans pushed the doorbell on the side & the door opened slightly & Undyne says "Hurry, get in here now." you guys did what she said & she shut & locked the big metal doors behind you three & her. "What's going on?" you ask Undyne "W-well, uhhh let's just s-sayyy, theoretically, that someone found that video & posted it on Undernet." All three of you felt your emotion mix together "WHAT?!?!?!"

You calm down a bit, but the brothers were on the floor, blacked out. "What's that i-in your stomach (y-y/n)?" undyne asked. "Well, that's why we came here Undyne. I'm pregnant w/ both Sans's & Papyrus's child." Undyne's eyes lit up in excitement "OMG, SO KAWAII" You laughed a bit 'cause of that "Yeah, but we need your help to see if you'll tell us who's babies who's." "Oh, i see. W-well follow me guys." You follow undyne, but Sans & Papyrus decide to stay on the floor.

After finding the results, the orange-yellow one's Papyrus's & the turquoise one's Sans's 'Sans was right about that one' you thought to yourself as you see Sans & Papyrus get up. "S-so, what souls whose child (y/n)?" Papyrus asked, rubbing his skull. "Sans was right about his being the turquoise one being his, so yours paps is the orange-yellow one." They smile at you, knowing that you'd make a amazing mother. "Now, back to a certain subject, who knows about that one night, i mean you did delete that video on that camera right Undyne?!?!" you asked in the best Sherlock Holmes impression.

(lol don't judge meh >:3)

The three of you were staring at Undyne, expecting a 'no' but instead you guys heard "W-well i may have ehhh sortaa uhhh, kept it on my laptop.". You were about to give her a piece of your mind, but Sans & Papyrus were holding you back, you calmed down & said "Why'd you keep it!?". Sans & Papyrus looked at Undyne like she was insane to keep 'the video' "Were you the one who did something w/ that video?" Papyrus ask, right eye socket glowing in rage. "I-I'd never do such a thing." Undyne said with fear in her eyes, "Was somebody else on that computer?" he asked in a booming tone, socket still glowing.

"I-i'd never let a-a-anyone touch my l-laptop." Undyne said, still scared for her life. Papyrus put her down on the ground gently, "Was there a time when you thought somebody got on your laptop dyne?" Sans asked. "W-well i did see Napsta-bot coming out of my room flustered."

All three of you froze, you thought having the royal scientist & captain of the royal guard seeing you three "boning" (again i had too, i got a skele-ton of puns that are really humerus & really tickle all of your funny bones, again sorry if i'm becoming cringe worthy) but now the number one celebrity in the Underground (& sans's idol) actually saw the three of you doing it as well!!

Sans was loosing his mind, blushing like crazy, feeling so embarrassed about how he knows that his idol saw him bare & with a boner doing things with you & Papyrus. You hug Sans close to you "Thing's could be worst." Sans smiles & hugs you back "Yeah Mwehehe." You kiss Sans & he kisses you back "Hey, don't leave me out of this. hehe" Papyrus kisses you & you kiss back. The three of you laugh a bit & hugged each other, Undyne was so focused on how adorable you three were, she didn't hear knocking at the door. She gets up & checks the cameras right at the entrance of the lab, Napsta-bot was waiting outside w/ his 'camera crew' (just Meta on mic control & the Nice cream bunny holding a video camera).

"S-Should I let them in?" she asked but saw you three cuddling on the ground. "Awwwww so kawaii" She laid a blanket on the three of you, opened the door & went outside to talk to Napsta-bot & his crew. "Heya dyne. Are Y/n, Sans, & Papyrus here by any chance?" he said with a sly look on his face "No, n-not here" Undyne said with a bit of panic in her voice.

(Me: Hey guy's, what should the questions be Napsa's gonna ask you Sans & Paps? just make a comment on what you think he'll ask...... Napstabot: Hey do it, please for me you lovely ladies & gents out there)