If you are a photographer looking to study modern erotic posing, study the StasyQ catalog—specifically the work of their model Tiffany in Set 620. Pay attention to how she bends the knee, how she relaxes the shoulder, and how she uses the hands not as props, but as framing devices.
Fans on platforms like IMDb often praise the cinematography of the mini-dramas themselves, which are shot with the high quality of actual Japanese TV dramas. StasyQ - Tiffany - 620 - Erotic- Posing- Solo 1...