Do we have a tag for this case, gentlemen? The private part of the yukkuri is very well-drawn so this thing is absolutely not suitable for all kinds of viewers, I first think about sex, but it's kinda loose and not very fitting that.
This is a common case between artists who are/were a hentai artist who draw the private part of the yukkuri so well that it looks like it's from a human.
This pool also lacks a lot of crucial tags, in fact, aside from a yukkuri type and monochrome, it doesn't have any tags at all, I know that this pool is long so tagging all of those is tedious, but the uploader should also tag some important tags, so some who want or don't want to see a particular thing may not be able to sort this out.
lewd is probably the most appropriate one, though hentai could also work. I guess stupid_sexy_yukkuri could also be used though that tag is mostly for bodied yukkuri (and I sincerely hope nobody actually considers this sexy). Or alternatively you could use do_not_want if you're disturbed by this
Really there isn't any standard for tagging hentai stuff
"Putting in, now putting it in nojeeee...
Hah hah hah...h""Putting innn...Putting innnnnnn...
Yuoooooooooo..."The second daughter Marisa was in great excitement."Yuoooooo
mamu-mamuuu
Such a beautiful mamu-mamu nanojeeeeee..."Right before Marisa's eyes, Bitch Reimu flipped open her mamu-mamu.*liquid flowing down"Okaaaay, take your time♡"*flips open mamu-mamu