Metamorphosis of Melody: Millie's Journey from Imp to Lucifer Morningstar

Question: Write a transformation story of Millie (from the Helluva Boss series) turning into Lucifer Morningstar (from the Hazbin Hotel series), complete with gender change, age change, height progression, and mind/mental change (with Millie's personality and memories being completely replaced with Lucifer's personality and memories, despite her best efforts of fighting these new personality and memories, making her, now him, completely forget he was an imp named Millie and only remembered ever being the king of Hell, a husband to Lilith Morningstar, a father of his daughter Charlie Morningstar, and being named Lucifer Morningstar). For Millie's appearance, she is a short imp with a long, devilish tail. She has red skin with white markings on her forearms and tail, eyes with yellow sclerae and black pupils, and long thick eyelashes that extend beyond the sides of her hair. She also wore shimmery, dark red eyeshadow, thick eyeliner and mascara, as well as black lipstick. Similar to her mother, she has two black horns with three thin white stripes and dark gray hair worn in a messy bob style with bangs that cover half of her right horn. She has a beauty mark on her left cheek and a gap between her front teeth. Millie also has a black tattoo in the shape of a heart on her left shoulder. Millie's head is noticeably more human-like (although still without a nose) than a lot of other imps, having rounder proportions and front teeth that usually appear flatter than the sharp conical teeth most demons have. Her usual attire dons an all-black color scheme with a tint of yellow; a simple black choker around her neck, with a cold-shoulder black crop-top, featuring golden-yellow buttons which holds the straps. She also dons a set of fingerless black gloves, complete with torn black denim-pants and black toeless footwear, exposing her hoof-like toes. Millie is a very lively and cheerful individual. Often with a smile on her face and rarely standing still, she is a clear extrovert and is not afraid to speak her mind. This is regardless to whether it's expressing her excitement or flipping off a co-worker. As the bruiser for I.M.P, she is shown to enjoy her job. Her meek exterior appearance belies a tough and very violent skillset. This is highlighted during a conversation Millie once had with her mother and sister. According to Moxxie, she is aggressive in "the sack" as well as her job. For Lucifer's appearance (after Millie turned into him), he has pure white skin, blonde hair, thick black eyebrows, black lips and a mouth full of sharp teeth. He has no visible ears or nostrils, giving him a less "human" appearance. His eyes are yellow with red slit pupils resembling those of a snake. He, like his daughter, has red cheeks. His eyelids are purple which give the appearance of eyeshadow. He wears a white high collar suit, a pair of knee-high heeled boots, a black bowtie, and a red undershirt with white stripes. He also wears a wide-brimmed white top hat, with a golden snake and red apple over golden spikes reminiscent a crown. On his left pinkie, he wears a golden ring. Lucifer carries an apple-topped black cane that matches his hat. He is slightly shorter than his daughter Charlie and his wife Lilith, but he is still tall compared with most other demons. Never short of puns, quips, or jokes, Lucifer Morningstar is zany, self-indulgent, easily bored, and jaunty, a witty and charismatic showman with a goofy and silly charm (emphasizing his love of polka music), while simultaneously maintaining an air of regality and menace to avoid making others feel too comfortable around him. Lucifer is a husband to Lilith Morningstar, and they both love each other very much, being described as "passionate, cheesy lovers" by some other demons.