A/n: this is for GaraffitiSplatsInk,thanks for the request,sorry it's so short...😥

Your POV

"Are you sure about this (Y/n)?" Sans asked nervously as I lead my blindfolded skeletal friend to my lab that was hidden in the depths of the woods. "Yeah,don't worry,Sans,we've been doing tests for a while,you don't need to worry!" I assured him,lightly squeezing his boney hand,he nodded,putting his trust in me. Coming to the giant structure that I'd been waiting to come across,I led Sans through the door,into the endless white corridors. Guiding him into a huge room,I took of his blindfold,showing him a machine that was,supposed to,make things increase size.

"Can you stand here?" I asked him,pointing to a spot on the floor,he nodded,standing where I pointed to,fiddling with his hands as I asked him,"Could you take off your armour and gloves?" He nodded,taking off his gloves and his shoulder pads,a confused look on his face as he handed them to me. Smiling reassuringly at him,I stood behind the machine,pressing some of the buttons in a pattern that made the ray able to grow him. As I pressed the final button,a bright light shone through the room,blinding me momentarily.

Sans' POV

When the light had faded,I opened my eyesockets,looking around,though I didn't see (Y/n) so I called out,"(Y/n)?" panicking slightly at not seeing them. My response came from somewhere below me,looking down,I saw a tiny (Y/n) waving rapidly at me,"What happened?" I asked them,confused,dropping my usual loud tone. "Well,the experiment went better than I'd hoped." they said,a grin on their face before continuing their explanation,"It was supposed to make you 15ft tall but it doubled your expected height!" Nodding in somewhat understanding,they smiled reassuringly at me,"Can you put your hand on the floor?" they asked me,I complied,setting my hand palm-up in front of them.

As I did this,I realised just how big I was compared to them,at my normal height I was the same size as them,a bit shorter,but now,only my hand was way bigger than them. They stepped onto my hand and I lifted it up to my face,seeing their excited expression better,"Woah! It worked even better than I thought." While they gawked over my new size,I asked them,"Is there a way we can change me back?" they nodded,pointing to the machine from earlier.