I'm not so much into rule 63 since reading guys names just puts me off, but the smut is written well enough to compensate in this.
You asked for requests, so I'm going to request Harry/Lily again, since you're open to incest. Some ideas I had:
-AU where Harry grows up with Lily after James dies somehow (perhaps gave his life for Harry), Lily could be attracted to Harry as he is an amazing child and give him hands on sex ed (it could be shown as common in the wizarding world).
-Time travel, after the war Harry has no wish to stick around and finds an obscure ritual to travel back in time. He arrives in Hogwarts in time for Lily's seventh year and enrols alongside her.
-Room of requirement: Harry wonders if the room can allow him to meet his parents, but as he is a teenage boy he can't help but notice that the version of his mother that he summoned (from the pictures he has) is not that much older than him, and the room acts on his subconscious desires...
-AU where Lily's soul never moved on, and Harry finds a way to recreate her body or bind her to her old preserved one, perhaps after he becomes the master of death or earlier. This idea is kind of supported by canon, when Dumbledore's bind on Harry fails when he dies in book 6, despite the protection Lily left him lasting past her supposed death. That could be the catalyst for Harry to look into it some more, or perhaps he could have visions where he communicated with Lily throughout his life because it was Lily's soul connected to his body, not Voldemort's. In his single minded pursuit to restore her Harry could become quite attached to her and well, no one's ever doubted Lily's love for Harry!
If you aren't into that, I would still like to read pretty much any Harry centric story you write.