One day, Mettaton was getting ready for his next performance. He was about to go on stage when he found a strange piece of gum lying on a table with a note next to it. It read, "Mettaton, I made this piece of gum. I believe it will change people's lives, and I want you to try it out. If something bad happens, PLEASE let me know! From, Alphys."
Mettaton wondered how the gum would malfunction, he decided to give a try. He put the gum in his mouth and started chewing. It tasted great! It had the taste of tomato soup, it was hot and creamy and he actually felt it running down his throat! It then changed to that of roast beef and baked potato, complete with butter and sour cream! Mettaton then had the taste of blueberry pie in his mouth, it was the most wonderful blueberry pie he ever tasted!
Just then, Mettaton had the strangest feeling on his nose. And then the feeling spread on to his face, then his shoulders! He looked at his arm and widened his eyes in fear. He was turning blue everywhere! And even this "clothes" started turning from hot pink to a deep purple. He then held his belly tight. "I don't feel so good." He moaned, and then found out why. His belly was swelling up by the second! He even felt his hips and rear balloon in size as well.
"What's happening?!" Mettaton said in shock and confusion. He was also somehow feeling that his expanding gut was making sloshing sounds. Mettaton was scared, soon he wasn't able to move anymore. His cheeks were also getting swollen, so his voice was a bit muffled when he screamed "ALPHYS! HEELLLP!" Alphys heard this and rushed over. "Oh dear," she murmured, "I thought this was going to happen!" She held her face in embarrassment. "I really shouldn't have tried to test it out when I expected the side effect." Mettaton just yelped "Alphys, what's happening to me!?"
"Well, the thing is, I'm pretty sure the gum added to much blueberry pie flavoring, causing whoever chews it to become 'one with the flavor of the pie'" Alphys explained. "So what you're saying is… I'm turning into a blueberry?" Mettaton realized. Alphys answered, "In a way, yes. And what you're inflating with is blueberry juice." Mettaton then seemed to stop swelling. By the time the swelling stopped, his head, hands, and feet were nearly sunken into his body. His arms and legs basically disappeared. His cheeks were the size of two tennis balls. He truly did look like a blueberry with that blue and purple color on him.
Mettaton frowned "I-I can't perform like this! Look at me! My figure is ruined!" Alphys then said "A-actually, I believe blue looks good on you" while trying to hide the blood coming from her nose. Mettaton replied "You really think so?" Alphys reluctantly nodded her head. "Thanks, then." Mettaton grinned a little, "However, performance will have to be cancelled tonight so I can break the news to the others." Alphys nodded again, "Got it." Mettaton's smile widened, he hoped he was a blueberry forever.