my brother's baka! don't disturb me! My sister is a masturbation boy!

Her younger sister is a masturbation. I'm just a masturbation if I have free time. Then he was found by his older brother, who made fun of him and said, "O-chan's baka!" Even so, Sanae likes her brother! Because Sanae is a dom who loves to be scorched, blamed for words, and squirted in sequence! Nevertheless, Sanae said, "O-chan's baka!" It’s a series of events.