It is a compilation book with hentai illustrations published at an event in Japan.
Here are some examples:
https://ecdnimg.toranoana.jp/ec/img/04/0030/90/33/040030903392-1p.jpg
https://ecdnimg.toranoana.jp/ec/img/04/0030/90/33/040030903382-1p.jpg
https://ecdnimg.toranoana.jp/ec/img/04/0030/90/33/040030903340-1p.jpg
Link to the book:
https://ec.toranoana.jp/tora_r/ec/item/040030903367/
Thank you so much!!
Here are some examples:
https://ecdnimg.toranoana.jp/ec/img/04/0030/90/33/040030903392-1p.jpg
https://ecdnimg.toranoana.jp/ec/img/04/0030/90/33/040030903382-1p.jpg
https://ecdnimg.toranoana.jp/ec/img/04/0030/90/33/040030903340-1p.jpg
Link to the book:
https://ec.toranoana.jp/tora_r/ec/item/040030903367/
Thank you so much!!