Buffy/Spike (Buffy the Vampire Slayer)
Sheldon/Penny (Big Bang Theory)
10/Rose & 9/Rose (Doctor Who)
These are just a few of the pairings I enjoy. I hang out on www.fanfiction.net WAY too much. Sometimes I feel like Penny on Age of Conan, finding myself 3 days later with cheetoes in my hair.