This one is really good. I did an image search and it appears to be from a video game or visual novel titled: Choukou Shinki Ixseal.
I just looked at a gallery of CG art from the game, but it mostly looks like ordinary smut.>>76907
The source for this one is: https://e-hentai.org/g/1169744/55eb1bcc59/
It’s really not hentai at all, so I’m not sure why it’s on that site.