This was the first time I was invited to my girlfriend's house to play. I was also introduced to her sister, Rino-chan. Rino-chan is a very beautiful girl, especially her terrifying breasts that make me unable to take my eyes off. It seems that Rino-chan is not wearing a bra, I can see her nipples are dimly exposed through the hoodie. And when my girlfriend went to wash the dishes, she pulled up her shirt and showed off her beautiful breasts in front of my eyes!! And from then on, every time I came to play, Rino-chan used her deadly body to seduce me. And as a result, I couldn't resist the temptation to plunge into her extremely stimulating sneaky sex. We secretly have sex even though our girlfriend is still at home, even nearby!