In a dimly lit room, a young teenage sister, barely 19, finds herself alone with her brother. As they chat, her eyes wander to the bulge in his pants, sparking a forbidden curiosity. She tentatively reaches out, feeling his hardness through his jeans. He gasps, but doesn't pull away. Emboldened, she unzips him, revealing his thick, pulsating cock. She licks her lips, her heart racing as she takes him into her inexperienced mouth. He groans, his hands tangling in her hair. She pulls back, looking up at him, her eyes filled with lust and a hint of fear. She wants to feel him inside her, but she's never done anything like this before. He understands, gently pushing her back onto the bed, spreading her legs. He teases her, his fingers slipping into her tight, wet pussy, making her squirm. Then, he replaces his fingers with his cock, pushing slowly into her, feeling her stretch around him. She gasps, feeling a slight pain, but it's quickly replaced by pleasure as he starts to move.