ZUKO-087 Making mischief with my four little sisters at home

Big brother (you) must dedicate everything for your little sisters. To ensure their bodies develop healthily, rub their chest area in the bath, stimulate their crotch area while sleeping together, and if necessary, inject semen into all of them to balance their hormones. However, why doesn't this effort get through to your little sisters? Sometimes they even find it disgusting... That's right, it's because you enter the room with a full-blown pervert face, in a naked count state.