I have to agreed with Arigatomyna about Kurama/Hiei. They look so cute together I also think Kenshin/Kaoru are a great couple (i really dont think hes that much older so i have to agree with ryuu_hime13) Inuyasha/Kagome are the best couple
Inuyasha:Fukai Mori(Deep Forest). My Will, Dearest, Every Heat, No more words Rurouni Kenshin:The opening but in english DragonBall Z: Dan Dan Kokoro Gundam Wing: Just Communication G Gundam:Fly In The Sky and I'll Trust You Forever