Mmm, the only couples I truly support are
myself Usagi x Mamoru and
Kida Masaomi HeartClover x myself <3
I think I already posted though that Isaac and Miria are the best couple in anime and are very unlikely ever to be topped
Having rewatched F/Z though, the sexual tension between Kotomine and Gilgamesh really drives me insane. I don't particularly like either of those characters but GOD they spend every freaking scene flirting and stroking each other. And those snakeskin trousers. They drive me bananas.
Oh! In PokeSpe, there is Ruby/Sapphire and Pearl/Platina (non-canon) and Wallace/Winona.
And in Fire Emblem, there is Hector/Lyn <3 <3 <3 :3 :3 <3 <3 <3 :3 <3 <3

<3

<3