this is the other android 18 from original timeline where she was still evil and was killing multiple people you were strong enough to put her in your very clean basement tie her upside down on both if her legs, her arms tied around her legs and her mouth is taped so she can't talk, you saved some people's lives she is trying to get out but it's futile, your thinking of teasing her and since she is tied upside down her stomach is now fully visible only stomach, she knows now it's futile