Well I love Yaoi some of my faves being Level C and Loveless.
Non Yaoi couples I would like to see
Sado Yasutora "Chad" and Kurosaki Ichigo From Bleach.
Call me freaky or weird but L and Ryuk from DeathNote.
Kakashi and Iruka From Naruto.
Kato and Kei From Gantz.
Gattsu and Griffith from Berserk.
Piccolo and Gokuo From Dbz.