This gallery was meant to be uploaded much earlier, along the original on pixiv (https://www.pixiv.net/en/artworks/116815969), but I lost access to the files.
Since then, Pixiv has only become more strict and rigid, so here we are, again.
These models and scenes are fanart based on the game Future Fragments that recently released on Steam and itchio, check it out if you like the characters and kinks displayed here.
The character cards for Koikatsu are available on the pixiv entry linked above.