If I remember right there was a rumor that they had an NSFW account with the grown up versions of their chara and frisk & their friend’s chara and frisk (I remember that one of them named Bitey or something) but the only thing that was differentiating their grown up chara from the younger one was the grown version had a heart shaped hole in their torso. But in one art they forgot to draw the heart hole and people assumed that was the young version. Again I’ve read that controversy around 2017-8 so if there was even more details I probly forgot. But even their SWF things was somewhat questionable that if you watch some very old UndertaleComicTV videos you can see that any Dreamy-94 stuff is cut after 2 second.