I know the doujinshi in page 5 is the author's Reimu x Marisa because that way they don't have to create one just for a panel or have legal issues if they use other without permission, but the idea of Yukari randomly giving hentai to Reimu about herself and Reimu reading them with like that makes me wonder why she just asks Yukari to stop bringing them to her and not ask her why that exists in the first place.