The soft rustle of fabric against skin sends a thrill down my spine as I slowly, carefully, lift the hem of my sister's skirt. I hold my breath, my eyes widening as I take in the sight of her toned thighs, her smooth skin, and the tantalizing hint of her panties. I can feel my cock twitching, eager for more, as I drink in the forbidden sight, the air thick with tension and the promise of something more.