Minamoto-kun Monogatari

A boy with a strikingly feminine appearance was targeted by female classmates in middle school, leading to a lasting fear of women. To escape this, he enrolled in an all-boys high school. After entering college and vowing to move past his trauma, he is forced to leave his family home when his father remarries. His father arranges for him to stay with his aunt, a professor at his university known for her beauty. Upon arriving at her apartment, she reveals her breasts and announces her intention to use him as a subject in her reverse Hikari Genji experiment.