He couldn't resist peeking when he discovered her naked and in a private moment. The forbidden sight of her curves as she touched herself left him unable to look away.
He was just passing by her room when the door caught his attention - it wasn't fully closed. Through the gap, he saw her naked on the bed, lost in her own pleasure. Instead of walking away, he found himself frozen in place, watching intently. His body responded automatically to the taboo sight of his curvy family member in such an intimate moment.
