Give it a look?
Title: A MISTAKE
Genre: Undertale Fan Fiction
https://www.wattpad.com/360975137-a-mistake-chapter-1-transformation
I started to feel a burning sensation in the pit of my stomach, but I instantly ignored it, the burns began to intensify and I screamed out in agony.
"S-STOP! I-IT HURTS!" I screeched clutching my stomach; I shifted in the position of lying on my back. Tears spewed from my eyes as I lifted my shirt to reveal my belly button. My heart dropped into my stomach when I noticed thick black veins, throbbing under my skin.
"WHAT'S HAPPENING TO ME!?" I cried, but no one was around to answer my question.
I watched as the black veins grew longer and started to run down my arms and legs, I couldn't tell if it was on my face too, but I knew it was. Suddenly, unexpectedly, I felt my eyes begin to burn, as if they were on fire.