My stepsister Hikari, who has large breasts, came to stay at my brother and sister-in-law's house for sightseeing. Living together with her, my brother couldn't help but be obsessed with her chest. He had been resisting the urge to push her down, but one day he finally couldn't take it anymore. He sneaked Hikari into a secret room while his wife wasn't looking and tried to force himself on her. Despite feeling guilty towards his sister-in-law, Hikari found herself getting aroused.
