@Kuzanagi13 That would be because it's definitely Hentai. Like, the tags I found on it were urination and fingering. If you google the name that was provided, it can be found quickly just not on this site.
@piyerus Don't forget that the classification "Safe" came out after SCP-999, so prior to that one they could only be stuff like Euclid or Keter or w/e. There was a blurb on it in one of the comics here, mentioning some of the more basic guidelines for classification.