I love reading fanfiction - mostly Inuyasha, Dragonball Z, Star Wars, Terminator: Sarah Connor Chronicles, & Harry Potter and sometimes Phantom of the Opera, Maximum Ride, Twilight, Sherlock Holmes in the 22nd Century, and The Queen's Thief series. Most of my favorite books aren't even listed on this site, but maybe one day I might stop being lazy and sit down and write something of my own.
Sesshomaru/Kagome if written well
Sesshomaru and Inuyasha's Father with either of their Mothers
Vegeta/Trunks, Chibi & Mirai as father & son
Anakin/Luke/Leia, as father and children
John Connor/Cameron Phillips
Sherlock Holmes/Beth Lestrade