ZUKO-087 Making Babies With My Four Younger Sisters

A brother (you) must give everything for his sisters. In order for their bodies to develop healthily, we massage their breasts in the bath, sleep together and stimulate their crotch area, and in some cases we inject semen into them to balance their hormones. But why is it that my efforts are not easily communicated to my sisters and sometimes they feel disgusted? …That's right, it's probably because you enter the room with a perverted wig and full bokki state.