Thecum01 presents a tantalizing encounter. A petite sister, curious and mischievous, sneaks into her brother's room. She finds him sleeping, his massive cock tenting the sheets. She can't help but touch, feeling its thickness. He stirs, catching her in the act. Rather than shoo her away, he sits up, letting his cock spring free. She gasps, eyes wide, but doesn't move. He tells her to touch it, and she does, tentatively at first, then with increasing confidence. She's never seen one this big, this close.