Aneki no Kounai Kaikinbi episode 1

Anna Hirose (23) finds out that her favorite younger brother, Yuichi, is satisfying his desires with her panties.
Anna, who was excited by the outlet of her younger brother’s abnormal lust, began to live a life that intentionally showed off.
She only showed her off at first, but as she gradually became her sister, she wanted her to emanate her desires.
And she finally decided to use her boobs to give her a nui.
The relationship that once started continues uninterrupted, and Yuichi escalate when he starts living alone.