I have assessed Ch'en to have a vagina on the basis of Lin using her hands to spread it. Hoshiguma is also likely penetrating Ch'en anally based on her position and given Lin is already occupied eating out Ch'en. One could call these guesses but I think they're intuitive and educated ones.
The artist tagged for Yuri on pixiv so I've added that, but it's unknown whether or not Lin has a penis. Please excuse my inexperience with tags.
I have assessed Ch'en to have a vagina on the basis of Lin using her hands to spread it. Hoshiguma is also likely penetrating Ch'en anally based on her position and given Lin is already occupied eating out Ch'en. One could call these guesses but I think they're intuitive and educated ones.
The artist tagged for Yuri on pixiv so I've added that, but it's unknown whether or not Lin has a penis.
Artist tagged it as futa. This is not yuri as far as danbooru is concerned.
Artist tagged it as futa. This is not yuri as far as danbooru is concerned.
And even if the artist had tagged it themselves, that's only relevant if the picture is ambiguous (and even then it's not determinative). If the artist had tagged it yuri, we would ignore them, because the image is very obviously futa.