I couldn't find any more appropriate place to make a request like this, so here it is. One day I've seen this art on subreddit dedicated to Aether/Lumine ship (however it wasn't featuring Aether) and since it is banned now the post with it is hidden too. Long story short, let me list the most significant tags that can be applied to it (though they didn't help me neither on this site, nor in Google)

6+ Girls, Lumine, Hu Tao, Fischl, Mona, Keqing, tied_up, bracers, table, 3d

Thanks in advance!