La Blue Girl/Ho Yay

Inverted Bait and Switch Lesbians, with Miko and Yaku : they have plenty of sex together (be it for training purposes, or because one of them has been hypnotized to attack the other, or for controling the horny werewolf impulses of Yaku), but apart from that those two aren't involved in a romantic fashion.
Foe Yay : Miko's rivalry with Fubuki initially begins like this, climaxing (pun intended) in a sex ninja duel of epic proportions. They switch to a lighter Friendly Rivalry afterward.