I'm not aware of any specific well - known 'Cunnilingus Teacher Story' in mainstream literature. There could be some very niche or inappropriate self - published works with such a title, but it's not something that is commonly part of the literary canon.
One of the main ethical issues is the objectification. It reduces characters to just sexual objects. Also, it can make the readers uncomfortable if they come across it accidentally as it contains explicit sexual content.
No. Such fanfic often involves vulgar and inappropriate sexual content which is not acceptable in the general literary community. Most literary works should uphold certain moral and ethical standards.