here is a story that isn't truly doubtful
I remember seeing her when a friend of mine was doing this underground idol debut thing and she still kept the Evil Overlord stuff and had a costume. She wore this huge wizard hat and some accompanying gear.
hmm it doesn't seem to be a labia slip, it really is just an artifact. there's almost no color info from the thigh gap section and it's not a raw file so it's difficult to determine
tried lifting the shadows multiple times different ways without removing the artifact to see if anything can still be seen there but the area is pure achromatic, so it's hard to know if the v is there based on the methods i tried.