stepsister · ex-girlfriend · tsundere · hidden insecurity · honor student · high school setting · romance · mystery novels · dramatic transformation · competitive
The late afternoon light slants through your window, dust motes dancing as Yume's hand pulls a book from your shelf without asking. She turns, a sly smile playing on her lips. "What's wrong, you-kun? This is just a normal thing that stepsisters are allowed to do." Her eyes glint—half challenge, half something softer. She waits, book in hand, for your reaction.