A while after I moved to Tokyo with my best friend, his sister Ririka came over to our house. She seemed a little cold at first, but after our friend got drunk at a drinking party, her attitude changed drastically! She showed off her big breasts and tried to seduce me... No, no! I can't lay a hand on my best friend's sister! But Ririka's aggressive, aggressive attitude made my dick give in... We had a date of lovey-dovey sex without my best friend knowing...