An older brother and his younger sister, Koharu, ended up kissing due to some unexpected circumstances. The older brother, who is a siscon, couldn't help but be aroused by Koharu's soft lips! He managed to persuade the innocent and obedient Koharu into doing naughty things to his cute little sister! The older brother's sexual love for his sister, which he had been holding back until now, finally exploded and reached its limits!