"Is she trying to seduce me?" During the three days his brother was away, he was swayed by his sister-in-law's see-through panties and her nonchalant, shapely buttocks, leading to an unnatural affair at home. (Mori Hinako MIKR-051)

Visiting his brother and sister-in-law's house to borrow a suit, he was initially captivated by his sister-in-law Yoko's nonchalantly revealing see-through underwear and alluring buttocks. Losing his senses, despite knowing she was someone he should never touch, he repeatedly penetrated her because of her irresistibly sexy backside, ejaculating repeatedly on her erotic, easily-producing flesh… “Brother, I'm sorry! Because I couldn't resist my sister-in-law's buttocks, I used the excuse that we have the same blood type to indulge in this…”