Dedication (Underfell Sans x FemaleElf!Reader)

Everyone thinks your at least 18, but your actually 1018. You're an elf who lives in the big city after fleeing your home, and one day, the barrier breaks and monsters are up on the surface again, and you try to be friends with them, even though if they knew who you really were, they would slit you're throat, for you watched them be sealed underground, watched as you're forest burned to the ground, and watched as monster kind and humans despised each other, in a constant conflict, but there's a skeleton, who you think is pretty tough, but slowly, as you become friends with him, you start to see who he really is- a big mental mess.