My little sister Rimu uploads extreme cosplay costumes to SNS and seems to be unconcerned about exposing herself almost naked in order to satisfy her need for approval, saying, "It will go viral and if people see it, it will raise my sense of beauty." Even at home, my little sister wanders around in revealing costumes that almost expose her breasts, shaking them, which is an eyesore, but as her older brother, I try to warn her, but I unconsciously look at her with lewd eyes...I was so annoyed and horny with my cheeky little sister who wouldn't listen to me that I forced her down and rubbed her breasts so hard that her nipple covers came off, and I made her understand.