My Sickly Younger Brother Is Both Sweet and Seductive

[Deceptively sweet, obsessive and unhinged younger brother + gentle, kind, clear-eyed older woman + younger man + two-faced characters] She cheated, and her one-night stand was with the company’s cute intern, a younger student. From that day on, whenever she came home and fell asleep, she would open her eyes to find herself transformed into her junior’s… enormous human body pillow??? And this puppy-like junior doesn’t seem quite as sweet as he looks. What on earth is going on?????? Though the younger brother is unhinged and obsessive, he truly loves his big sister and would never hurt her. Rest assured, this is super sweet and indulgent. Two couples, both with younger men. The male leads must be pure, with every strand of their hair belonging to the female leads. The female leads are pure once they get together. Main couple’s male lead: deceptively sweet, obsessive on the inside, puppy-like on the outside. Female lead: gentle, the true heiress, kind but clear-eyed. She has an ex-boyfriend, but the author will make him kick the bucket. Supporting couple’s male lead: cool guy, working his way through school, oozing sexual tension. Female lead: bold, a workaholic, neither initiates nor rejects, and doesn’t believe in marriage. A sweet, indulgent story based on a wild idea. If you like sweet romances between older women and younger men, dive in! If you’re looking for excellent writing and flawless logic, proceed with caution.