Melodic Metamorphosis: Black's Transcendence into Lucifer Morningstar

Question: Write a transformation story of Black The Dylanus (an original character made by the Deviantart user Dylan613) turning into Lucifer Morningstar (from the Hazbin Hotel series), complete with age progression, height progression, and mind/mental change (with Black's personality and memories being completely replaced with Lucifer's personality and memories, despite his efforts of fighting back those new memories and personality, making him completely forget that he was a teenage mortal boy Black and only remembered ever being the king of Hell, Lucifer Morningstar). For Black's appearance, he is a 5 foot tall, 16 year old boy who has a lean build for his size, tan skin, medium-length black hair (that reaches his chin, although not covering his face at all) with red streaks running down, and has dark gray, almost black irises. He wears a black hoodie, a dark gray t-shirt, and pale gray jeans gray. He also wears white socks underneath his black tennis shoes with golden ankle-bracelets. In addition, Black's jacket has light gray artificial fur on the top and on the ends of the sleeves, where they are outlined by the golden bracelets on top. Black is a serious, smart, considerate, and understanding character, who is a slightly older brother to Dylan, who is more playful and kind. Despite his small frame and being a teen, he, along with his brother Dylan, goes in the way to protect his homeland against various villains and monsters (always successful, even if some are more difficult than others). Despite these traits, he does have some flaws, such as his occasional annoyance to Dylan's playful demeanor, being quite weak without superpowers (which he actually does not have and only obtains them when using special devices), and has fear and demons alike since he views them as nothing more than pure evil monsters. For Lucifer's appearance (after Black turned into him), he has pure white skin, blonde hair, thick black eyebrows, black lips and a mouth full of sharp teeth, with a biologically mid-to-late 20s aged body (despite being thousands of years old and being immortal). 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 (Charlie Morningstar), has red cheeks. His eyelids are purple which give the appearance of eyeshadow. He wears a white high collar suit, a black bowtie, black knee-high heeled boots, 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 quite tall. 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. There should also be quotes from the characters in this story so we know what they're saying and what they're thinking.