I've read several fics where Harry is accidently turned into a girl. What if it wasn't an accident?
While hunting Snorkacks, Harry is very upset that Hermione is with Ron. Luna has a way to 'console' him.
A perfect day on the pitch becomes an erotic dream for Harry.
After defeating Voldemort in his final year, Harry requires a rare ritual to save his life. Luckily, he has friends who are willing to help him. H/Hr, H/Parv, H/Luna, H/Tonks, H/Fleur. Canon person...
The Harmony (Harry/Hermione) version of the last book. Hermione thinks twice about her decisions and Harry realizes he is in a war, and all enemies are a target, not just Voldemort.
Ten years post-Hogwarts, Ginny and Ron have been murdered, and Hermione is the prime suspect.
Harry is told that he has the power of Love? With the help of a Gabrielle, Ginny and a few others he learns exactly what this means! Post -OOTP