Ms. Teach (Sans x Reader)

(Y/n's POV)
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Few days after, I started to open the gift Sans gave me after Valentine's Day... I was just sitting on a couch inside my house. Near the window, which is seemingly snowing lightly.

"Whoa..." I looked at the gift in awe. It was a necklace with a little, white, upside-down heart locket. I opened it an saw a picture of Sans smiling, with his fingers resembling the "Peace" sign, with the words...

"don't give up wherever you are, alright teach?"

"Thanks, Baby Blue..." I said, putting on the necklace. I also saw that there was something beneath the gift box. I carefully got it from the box and read it... It's a letter!

hey, teach. if you can read this long note...

how's your day been going so far? i just wanted to give you something great for valentine's, but tibia honest, i had exactly no idea what to gift for you though.

i could think of... perhaps, a little ukulele, or maybe anything that you wanted to play music with, but... i can't afford any instruments or can't find much in here. man, i wish i could make it up to you for a simple gift...

hey, cheer up! we don't want a bonely heart this valentine's day, eh? (hey, did i make you laugh out there?)

but seriously, can you at least... accept this little locket i brought from a jewelry shop. i know it's only a necklace but, at least it suffices for your gift this valentine's. it has a little picture of me too!

love you, teach. i'm happy that you're my valentine's.

from, sans

"Oh Sans... you don't have to really write a number of paragraphs for me now. It sounded like you were writing a letter instead of a note." I laughed at the letter he wrote. He's so adorable and sweet, to be honest. That's what I mostly love about you, Baby Blue.

"I do like your necklace, baby... thanks for this simple gift. It... does remind me of you." I said, holding the little heart locket with my fingers.

"Sis! Do you wanna go to Hotlands with me?" She asked, suddenly bursting through the door. It shocked me for a little while but then I calmed down.

"Why? Do you have to meet Alphys there?" I asked, still panting for breath.

"Yup! I have to send Undyne's letter to her. She should've sent it during Valentine's Day though..." She pouted

"It's fine. I'll come with you..." I said

"Ok! But, let's be careful... The Lab seems to have something strange going on..." She said

"Okay?" I said, and I wore my loose t-shirt and jeans that are cut to shorts, layered by a large (f/c) winter coat, (s/f/c) scarf, and some long snow boots to finish.

"Let's go to Alphys' Lab!" I said, and we walked outside my house to go to Alphys' Lab.

~ At The Lab... ~

"Why does it seem so dark?" Frisk asked, looking at the inside of the Lab. It was... of course, dark and all lights were seemingly switched off.

"I... I don't know. Maybe, you should bring it to her another time." I said

"Wait, but Undyne said that she needs to send it to her now." Frisk stopped me, pulling my loose t-shirt.

"Oh, so... where are you going to slip it in?" I asked