So... I saw these boots and thought it looked a bit like tar dripping down where the heels should be, not just teeth in a mouth... and I thought it might be cool as a demon form cosplay element for Sebastian.
Instead of the heels that seem to become infinitely too small at the bottom, it's more like before those boots fully form, so it's like that inky tar-like substance that composes the demon's Eldritch Abomination form. It also evokes the idea of the demon having multiple mouths and forming various animal shapes.
Sorry my pics aren't any better than these right now, but I just now tried them on, and it's after 1:30am, and I should be asleep. I have a CT scan this morning, and I have to be there by 6:50am. I'll get better pics later, preferably with someone taking pics while I'm walking around or something.