Been looking for a specific hentai for a long time.
First found it on fakku, before they even wiped all "fan" and "unoffical". General plot goes like:
>guy has masturbation material that are photos of a girl he likes
>masturbation material are all personal photos he's taken with a camera
>wants to take more photos, but nude ones this time
>sneaks and hides in girls locker room since the girl is an athlete with camera ready
>girl comes in and discovers him
>girl knew that he was there and even knows that he has been basically stalking her the whole time
>flattered, the girl allows him to take more revealing photos
>they have sex, all the while he is taking photos
>girl confiscates camera, with all these photos, once done
>guy shrugs it off, accepts it, and nonchalantly goes back to using his regular masturbation material
This is as much detail as possible, probably not exact but close enough.