The siblings' eyes lock, the air between them charged with an unspoken, forbidden desire. The brother, his hand trembling slightly, brings the toothpick to his sister's lips. She opens her mouth, her tongue darting out to wet the pick, a clear invitation. He slides it in, her teeth clicking softly as he cleans them, his knuckles brushing against her full lips. She leans in, her breath hot on his fingers, and takes the toothpick deeper, her eyes never leaving his. The brother swallows hard, his cock straining against his zipper, the taboo act pushing them both to the edge of ecstasy.