My mother-in-law's shameful behavior, especially her voluptuous, mature figure, made me erect. (Yoshii Miki VENX-268)

He saw his wife's mother changing clothes. She was wearing a corrective bra, which she had put on to prevent middle-age obesity; it looked very tight, and her beautiful, large breasts now seemed about to burst out. The son-in-law couldn't imagine such a wanton body from her usually dignified appearance, and he swallowed hard. He couldn't bring himself to do it. He tried his best to use his reason to forget, but the stimulating scene of changing clothes made him unable to resist, and he assaulted his mother-in-law.