Swing Out Sisters (Extended)

It all starts with a big-breasted girl basking in a bubble bath. Gradually, the foam dissipates, and she realizes that there is someone else in the bathroom. This is her brother Yu. The girl tries to express her displeasure, but her brother reminds her that yesterday they also washed together, and everything was fine. He suggests that she relax, and although she initially objects, she eventually agrees, remembering her childhood.