My brother and I have been living together since our mother suddenly passed away when we were young. He couldn't let go of breastfeeding after she died, so he continued to suckle my breasts for over ten years instead. As time went by, his tongue movements while suckling became more skilled. Meanwhile, my sensitivity increased, making my nipples, milk ducts, and milking lines incredibly sensitive erogenous zones. Despite acknowledging that our relationship was abnormal, my brother and I found ourselves unable to break free from this twisted bond, eventually leading us down a dark path filled with even more perverse incestuous desires...

ママの突然の死から「それ」は始まった。乳離れできない弟はそれから10年もの間、姉のおっぱいをおしゃぶり代わりにして育った。弟は年々吸う時の舌の動きが上達。姉は年々敏感になり、乳首と乳腺とミルクラインが性感帯として覚醒。異常な日常だとは認識しつつも「バグった母性」の姉と「狂った発育」をした弟はその歪んだ関係を断ち切れずに更にいびつな近親関係を築いていく事にのめり込んでいった…。