Millie, a female imp, is about to turn thirty years old. She's been the boss of her small demon clan for ten years and has finally reached a level of success and power she's been dreaming of her who

Question: Write a transformation story of Millie (from the Helluva Boss series) turning into Alastor (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 Alastor's personality and memories, making her, now him, completely forget he was a female imp Millie and only remembered ever being Alastor the Radio Demon). 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. For Alastor's appearance (after Millie turned into him), he is a slim, dapper sinner demon with beige-colored skin, and usually has a broad smile full of sharp, yellow teeth on his otherwise-human-like face. He is approximately 7 feet tall. He sports a pinkish-red cropped, angled bob-cut with black tips at the ends and two large, black tipped tufts of hair extending from the top of his head, evoking the ears of a deer. The style has an undercut at the back, and two small black antlers protruding from the crown, which can grow in size in his full demonic form. Alastor's eyes have dark-red sclerae, bright-red irises and thin black pupils (which can change into the shape of radio dials when shifting into his full demon form). His forearms and lower legs fade to dark grey, and he has red hoofed toes and red fingers. Alastor wears a red pinstripe coat with dark-red lapels piped with white, which is ragged along the bottom hem. Underneath this he wears a bright red dress-shirt with a black cross on the chest, and long black dress pants with matching bright red cuffs. He also wears a dark-red oval-shaped monocle, rimmed with black, over his right eye. He accessorizes with a black knotted bowtie with a bright red center, black gloves with red at the fingertips, and black pointed-toe boots with red deer hoofprints emblazoned on the soles. Alastor also carries a thin cane with a sentient vintage style microphone attached to it, which he uses to play sound effects and broadcast his voice.