An older brother demands sex from his step-sister, who lives with him, using her weaknesses as a pretext. The younger sister continues to refuse, but eventually gives in to her persistent older brother... Reluctantly, he inserts his penis, promising to keep it a secret! However, the younger sister shows no reaction! Seeing this, the older brother secretly applies an aphrodisiac to his penis and starts to piston slowly! Then her body starts to heat up and she gradually becomes aroused! She has changed so much that she has multiple orgasms from her brother's penis, even though she hated it so much!