Mature stepbrothers in their 20s gather in large numbers. They have mature bodies that are different from those of younger guys, overwhelming sexual desires that reach the pinnacle of their lives, muscular cocks that have penetrated numerous holes and assholes that are not too tight, and a wealth of techniques acquired through their various sex experiences. These tough stepbrothers blame each other and dig each other up, and with just one word: 'Think of it as the last sex of your life and enjoy it with all your might', a real, serious sex battle unfolds without any acting instruction whatsoever.