[ties (takei ooki)] Imouto Succubu [XO Manga]

A timid younger sister undergoes a supernatural transformation into a horned, tailed succubus, and her older brother becomes the one person she trusts while learning to embrace this new side of herself. What begins with embarrassed dependence and nervous curiosity grows into a taboo, increasingly intense bond shaped by desire, vulnerability, and the unsettling pull of her demonic nature. A closing pink title card credits TIES and identifies the work as a 2022 winter presentation.