While there are no academic "papers" on this specific topic, the content you're referring to is a collaborative digital media series featuring (椎名もも) and Ayu Makihara (牧原あゆ).
: Multiple volumes are available, such as Futari Vol. 14 , Vol. 15 (Orange Bikini) , and Vol. 16 , often listed on Amazon Japan .
If you are looking for specific volumes or collections, you can find them through various retailers:
: There are DVD and Blu-ray releases, including a "Making Edition" and a "Director's Cut Edition" .
: Collectors can often find older or discontinued CD-R and DVD-R versions, such as Futari Vol. 25 , at specialized stores like Mandarake or Suruga-ya . Momo Shiina Ayu Makihara Futari 14 Digital Photo Collection ASIN: B0BMQJNTBF. Date First Available: November 17, 2022.
Ayu Makihara Momo Shiina Futari Director's Cut Edition Part 2 Blu-ray
Amazon.co.jp: Ayu Makihara Momo Shiina Futari Director's Cut Edition Part 2 Blu-ray : DVD.
Amazon.co.jp: Futari - Making Edition Momo Shiina Ayu Makihara DVD Futari - Making Edition Momo Shiina Ayu Makihara DVD.