Someone is writing them because in some alternate universe we're fictional, that's why. It doesn't mean anything other than some people have too much time on their hands and weird tastes in this kind of stuff.

[She looks down now, lets herself look over the image and feels her face get warm again at the sight of it before pushing the doujin back at him.]

And if you did care at all about how I feel you wouldn't be reading this stuff because it could relate to Haruki.

[And with that said, she turns on her heel and walks out of the shop. For some reason she feels exhausted and.... disappointed.]

'But in what? The sharp reminder of how much everyone acts like the world runs on my love life? The fact that, for a second, I was actually curious about what it'd be like to kiss him? That he apparently didn't take into account how I would feel about him reading those things? Stupid teenage hormones! I barely understand myself!'