Ki wo Tsuke na yo, Onee-san.

Also known as: 気をつけなよ、お姉さん。, 注意安全哦, 大姊姊, Big Girl and Small Girl, Be Careful, Onee-san, 小心喔，大姊姊

by Sasuke

The OL Tae Honda went swimming at the community pool, but her lack of exercise caused her to cramp up in the water, when she was saved by a tall, beautiful girl Mai Igarashi. Feeling attracted to her savior as she left the the pool, Tae saw Mai come out carrying an elementary school backpack… Note: Includes 4 extra chapters.