"Big brother, you're so gross!" One day, a high school girl's little sister who hates her big brother is drugged and becomes the victim of nipple torture training... Her salmon-pink nipples, which have become super sensitive from the drug, are pinched, licked, and kneaded, and her body becomes one that orgasms over and over again from her nipples. It feels so good that she can't resist and ends up getting creampied... Now she is addicted to the incestuous sex with her brother, who she hated so much...