Reituki is a slash pairing consisting of Reita and Ruki from The GazettE. It's one of those pairings that will never get old like AoiXUruha.
Reita: I can not bear it any longer, Ruki. I must have you tonight!
Ruki: *blush* Okay. If you insist. It will make the Reituki fangirls happy.