There's a hentai with a scene where a blonde loli is being raped on a stand in front of a lot of men. She has the same hairstyle as the girl in the picture and is wearing a green outfit. I think she's also some sort of princess.
Not the same hairstyle, but sounds like -
Kuroinu Kedakaki Seijo wa Hakudaku ni Somaru - Episode 3
that's it. Thanks