A gentle older sister smiles and trains her impatient younger brother to improve premature ejaculation! My younger brother ejaculates so prematurely that he becomes the laughing stock of the whole class when it becomes known that he was dumped by his girlfriend. Her older sister, Sora, can't bear to see such a pitiful younger brother, so she practices sex at home and at school until his premature ejaculation gets better. There are times when Sora's pussy feels so good that she can't hold back and ejaculates, but even then, she takes it gently.