Here's a premise I wanted to do, but have been to lazy.

Little Red Riding Hood gets her first period in the woods. This attracts a large wolf, which begins licking her while she's too terrified to move.

As she begins to orgasm, he sinks his teeth into her vagina and begins to devour her.

—- Another —

League of Legends fanfic. Ashe gets caught by Trundle. He attempts to rape her, but she's too tight to insert it. So he decides to "loosen her up".

To do so, he starts by violating her with his tongue. At first, she assumes he only means to loosen her in the foreplay sense, but instead he bites a chunk out of her vagina to create larger opening. Then he starts fucking her insides out as he devours her upper body.