[Kaneko Ken] The True Phimosis Treatment by Sis

Yuuto's search history betrays him when his sister discovers he's been quietly researching a fix for his phimosis, and she appoints herself his personal physician — daily stretching sessions with steroid cream, her fingers working his mortified cock while he squirms under her cheerful, unblinking gaze. What starts as unbearable 'treatment' spirals into catastrophe when she pulls too enthusiastically, leaving him with a foreskin stretched half the length of his shaft and a very public hospital visit where a room full of giggling nurses gets an unobstructed eyeful. A comedy of sibling 'care,' forced exposure, and escalating embarrassment that only gets worse the harder she tries to help.