[Kaneko Ken] The True Phimosis Treatment by Sis

When Yuuto's sister snoops through his computer and uncovers his frantic searches for phimosis surgery, she appoints herself his personal physician—subjecting her mortified little brother to daily foreskin-stretching sessions that leave him exposed, erect, and begging her to stop. Her bedside manner swings between doting encouragement and merciless teasing as she marvels at how big and cramped his trapped cock looks, but the amateur treatment backfires spectacularly when the skin ends up stretched half as long as his dick itself. A bonus page trails the hapless boy to the hospital, where a chorus of giggling nurses gets an eyeful of his botched condition while his furious sister seethes at their laughter.