The brother, eager to test his sister's limits, presents her with a massive dildo. She tentatively takes it into her mouth, swirling her tongue around the shaft. He encourages her, pushing her head down until she's deep-throating the toy. She struggles to keep up, drool and saliva dripping from her chin. He then pushes her onto the bed, spreading her legs wide. He teases her clit with the dildo before ramming it into her pussy, causing her to scream in pleasure. He fucks her hard with the dildo, making her cum hard before pulling out and cumming all over her stomach.