At 3 a.m., unable to sleep, I was startled when my older sister Ena returned home drunk from a night out with friends. Mistaking my room for hers, she stumbled inside, clearly intoxicated and slurring her words. The usually strict Ena, notorious for her bad behavior when drunk, clung to me unsteadily. When I pushed her away, she snapped, "You don't listen to your big sister anymore?!" Her touch sent involuntary shivers through me, and my cock quickly responded. Noticing my arousal, she giggled, "Huh? Little brother's hard just from being with big sister? Hee, so cute." As the familiar sisterly figure I'd known since childhood transformed before my eyes into a seductive woman, my resolve began to melt away—until all that remained was raw desire.