JUFD-783 - Tried to seduce my virgin brother, but he turned the tables and destroyed me

Haruna and Tetsuya become step-siblings after their parents remarry. Trying to bond, Haruna suggests 'playing doctor,' but gets shocked by the size of Tetsuya's manhood. She tries to seduce him again, only to become a slave to her brother's insatiable, beast-like libido.