Let’s Draw Manga: Yaoi Boys Love Team BL Pose Photo Collection Boys on a Holiday [Softcover] compiled by Comickers Editorial, by Ltd. Bijutsu Shuppan-Sha.
Hmm. According to Amazon Japan, Comickers Editorial is only credited, but Amazon.com has only Bijutsu listed. I decided to mention both because, it’s just too confusing to be bothered with.
I found these sample pages from a Taiwanese site, which was altogether confusing. Images belong to Bijutsu Shuppan-Sha CO., LTD.