Though I was supposed to be taking care of my feverish older sister Momo, I became aroused by her sensual breathing and sweaty skin. As I wiped her chest, my heartbeat surged, and when a secret toy slipped out from under the covers, I saw my sister—resisting yet clearly aroused—and my feelings began to change. A few days later, when I fell ill and Momo nursed me, she teased my nipples, stared at my erection, and whispered, "This is payback from the other day," leading me into forbidden penetration. A passionate, taboo caregiving tale of sick siblings crossing moral lines, entangled in a whirlwind of conflicting emotions.