Swapfell is a collective au. Simultaneous attraction and curse of collective au is absence of canon. Often there is not even a design. There is only a concept: an evil Underswap or a swapped Underfell (which is basically the same, since 2 + 3 = 5 and 3 + 2 = 5). Thus, trying give name for сertain design is insanity. I'm not the only one who’s annoyed what is happening now with this tag because of a сertain popular artist. I guess this artist just trying to do their favorite abusive/bdsm version of swapfell as separate au (or what), but this looks really weird because it's not separate au, it's just skele-porno/pointless skele-angst and one of many versions of swapfell yet. (but the most popular because there is incest and porn, and it's really bad reason for turning exectly it into au). All "au" on picture invented by random, except for the first two. I hope the picture is indicative. (I deliberately no drew my own version of swapfell)
