Well, 'ass smell fanfic' sounds like a rather unusual and perhaps even unappealing term. It might be some sort of fan - made fictional story within a particular fandom that has to do with the idea of an 'ass smell', but this is really just speculation. It could also be a made - up or misnamed thing that doesn't actually have a common or known meaning in the general fanfic community.
Well, it could be that while the mom is sleeping, a pet might have accidentally passed gas near her, and that's the source of the 'ass smell'. Maybe the family dog had some indigestion and let out a stinky toot right beside the sleeping mom.
Definitely not. Popular fanfic genres usually revolve around elements that are appealing to a wide audience, such as character relationships, epic storylines, or interesting alternate universes. The concept of 'ass smell' is not something that would attract a large number of readers, so it can't be a popular genre.
First, try to find the source of the smell quietly. If it's a pet - related issue, gently move the pet to another area. For example, if it's a cat that's the culprit, pick it up carefully and put it outside the room.
Once there was a mom who loved baking. She would often make delicious cakes and pies for her family. Because she tasted all her creations, over time, she put on some weight, especially around her hips and buttocks. But her family didn't mind at all. Her children thought she was the warmest mom ever as she would always have a big smile and hugs to offer, along with those scrumptious treats.
One possible story could be that there was a baby who was playing near the sleeping mom. The baby had a soiled diaper which was giving out an unpleasant smell, like what you might crudely refer to as 'asshole smell'. And the baby was making little noises that the mom was still sleeping through.
One way is to replace the negative words with positive adjectives. Instead of 'biggest fattest ass smell', we could say 'the kindest, most loving mom'. This completely changes the tone from something inappropriate to a positive family - friendly statement.
In a non - erotic context, 'biggest fattest ass mom' could potentially refer to a mother who has a large posterior in a non - sexual, perhaps comical or descriptive way. For example, in a story about a family where the mom is known for her big buttocks, it could be used in a light - hearted, non - sexual way to describe her physical characteristic, like when family members tease each other in a friendly manner.