Since you brought up Exalted fap, while I've never written fapfics before, I did have an interesting idea. You know how Alchemicals need human contact to keep from turning into emotionless, hyperlogical machines? And that some of them take mortal lovers for this exact purpose? The idea is that the fic would follow a male factory worker that accepts the position of the lover of the female Alchemical champion of the city.
He goes in there expecting a cushy life away from the factories, but finds its even more work keeping a robot woman who is frequently isolated from human contact satisfied. Thus, in an effort to stimulate her both sexually and emotionally, he engages in very elaborate sexual and emotional scenarios with her. Things like having sex with her in locations where they might be found, or deliberately putting himself in danger so she could rescue him, or making sure she finds out that he's sleeping with other people so she could get jealous and have angry sex with him.
Basically a heroic mortal constantly risking life and limb to keep an Exalt happy. How's that sound?
I had another idea with the same premise (going to elaborate lengths to keep a powerful woman sexually satisfied), but in this case it's a Chose of Serenity Sidereal trying to keep Mnemon (a power hungry superpowered noblewoman) distracted from her schemes of world domination.
He uses various resplendencies and his charms to find out some of her deepest and most secret fetishes and fantasies, and then bring those scenarios to life for her.
Hell I'll try to write both once finals are over next week. Again, though, I've never written fapfiction before, so criticism and feedback would be welcome.c