So, I was searching for post https://e621.net/posts/2431597, but I was having difficulty because the post was not tagged with autofellatio, but instead, auto_penis_lick which I had no idea was even a tag. I nearly added the tag to the post but then I realized there might be some technicality for this. The description for autofellatio describes it as "Penile masturbation where a character's mouth stimulates their own penis." Personally, I would consider the tongue to be part of the mouth, but I just want to make sure that this would be the correct definition or not. If not, could we potentially update the wiki to give this distinction between the two tags?

The penis lick wiki page does say, "Not to be confused with fellatio," which implies the two acts are considered separate on this site.