This is a very, very specific kink, but I wonder if anyone has seen even a single image of it. Autocunnilingus can be sexy and all, but what about *unwilling* autocunnilingus? Either a machine or magic forcing a girl to eat herself out? Can you think of anything more humiliating than cumming into your own mouth and swallowing?

This is close: rule34.xxx/index.php?page=post&s=view&id=2551808

If only GlaDos was forcing Chell to...

Here's another one: rule34.xxx/index.php?page=post&s=view&id=1184334

She almost looks sad that she's doing that...

Here you go...hope you like furry:

imgur.com/a/COD8b

I don't like furry, but the situation is hot enough that I love that image anyway. <3

Could be nice combined with futanari.

I think I've seen a futa version of this quite often at the very least, the futa girl gets her dick between her tits all the time.

How about combining it with public use? Fold a girl up so her mouth is inches from her pussy and stick her in a wall so guys can push their cocks inside whenever they want.

"You only have two jobs here. First, when a cock is inside you, tongue your clit until you cum. People pay good money to have your pussy convulsing around their shafts. Second, when they finish, eat yourself out and swallow all the cum. You need to keep your pussy clean for the customers. Do these two things and we won't have to punish you."