You are a resident of Hometown, you go to the local high school, and have a few friends. Your best friend is Asriel Dreemurr, a nuban goat monster, son of the preschool teacher. You two hung out pretty often.
One day, you were over at his house, basically doing nothing, both of you were bored out of your mind. You wanted something, anything to do, after about an hour of just laying around and talking, Asriel got an idea.
You watched, interested as he got up, and went into his closet, and grabbed random stuff out. He took out a random book, it seemed like a fake book about rituals, "Why not?" You thought.
He opened the book and followed along with it, making a small circle, and instructed you to sit right in front of him. You found it silly, and sat down, as he recited the words in the book. As he finished it, a flash of light absorbed the room, you fell unconscious.
You opened your eyes, confused, you felt weird, right above you, staring into your eyes... Was.. you. Your old body... You sat up, looking at the body you're currently inside of... You were in Asriel's body??
You were now an anthropomorphic white furred nuban goat monster, you now had small horns and a snout that protrudes out, along with a small fangs in your new goat mouth. You have small tufts of fur acting as hair for you. You are also wearing Asriel's clothes, a large green shirt with a stripe on it. You weren't even wearing shoes, instead just bare white furred paws, you also had paws as hands.
You were confused, and failed to process what happened, as Asriel spoke out, managing to get your attention away from your new body. He was in your old body now, he was also confused.
Asriel: "A-are you okay?? I-I didn't think that spell would actually work!!"