A Sweet Theory

1. I'm sorry

Chapter Summary: — —
Hey! Just to make it easier, here are the names of the AU skelebois

UF pap | Edge UF san | Red
US pap | Stretch US san | Blue
SF pap | Rus(mutt) SF san | Black

_____________________________________

"Alphys. Honey, please stop." Undyne frowned, leaning against the door frame. Her arms crossed over her chest as she watched you fondle with colourful wires in front of a large overtowering machine.

You paused for a second to look over at Undyne. The glasses on your nose falling lightly, pushing it back up with your fingers. You smiled apologetically.

"I'm sorry, Undyne... I have to do this. It can prove so much we don't know! If I get it to work we can put humanity a few hundred forward!" You stamppered, turning back to the wiring. Pushing the motherboard into place after triple checking the wires. It clicked in place, making a wide smile appear over your face - turning to look at Undyne - her long red hair pulled into a high ponytail, her eyes widen with brows upwards.

"It'll only take me a few hours- you can go back to sleep, I'll come when I'm finished." You say, pushing yourself to stand instead of crouching to the panel.

The Machine was grey, scraps of metal carefully placed together like a puzzle piece. Several of the knobs were from old car parts - stuff you found at the junkyard several years ago after drawing out the blueprint.

An arm snaked around your waist, pulling you into the chest of your lover. A startled squeak coming from your trembling lips - your face blooming in red. Your hands flew up to cover your face as Undyne left soft kisses over your exposed shoulder, slowly trailing up your neck and nibbled on your sweet spot.

"U-Undyne!" You stuttered, instantly shutting up when she twirled you around and lightly pecked your lips.

"Papyrus and Sans are here, don't want them to think we're up to no good." She winked, her honey hazel eyes glistening in the artificial light above you.

You flushed deeper, covering your face and wiggling out of her hold. "They're here?! When?! I-I didn't make anything for them yet!" You fretted, taking out your phone from the lab coat's pocket, taking off the protective shades - your mouth hung open at the time and date.

"It's.. February 14?"

"Yep! Happy Valentines, Alphy~" Undyne grinned widely, the fangs clearly showing with her pearly white teeth. Her nose wrinkled softly and her eyes tightly shut.

You frowned, but 'aw'd' softly at her cute expression. Standing on your tiptoes to peck her nose, you pushed your phone into your pocket.

"Happy Valentines, Undyne."

***

"You need to stop!" Sans shouted, standing in front of the lab's mechanical door - it whizzed open for entry. Gaster stood behind you, a frown on his usual smiling mouth, the black turtleneck lightly wrinkling with his arms crossed over his chest.

"you're obsessed, alphys!" Sans shouted. His blue eyes looking desperately into your (colour) ones. He placed his hands on his chest, balling his white shirt in his trembling fists. "can't you see you're hurting everyone around you? you forgot valentines, you forgot your anniversary!"

"Sans..." you frowned, your hold tightening onto the blueprints in your arms, uncaring if you crinkled them as you stared in awe at Sans. Your mentor behind you with the same painful energy. "I'm almost at a break through. I just need a few more-"