Based on Vampire Knight. Yuki Cross realizes Zero is more a part of her life than she knew. Written in both Zero and Yuki's point of view, you will see the difficult trials two vampires go through in "A Decision Made"

Some years have passed, Kaname and Yuuki are happily married... Or are they? Zero still loves Yuuki, and Kaname is furious to suddenly realize something absolutely unthinkable has been going on right under his nose. KanamexYuuki, ZeroxYuuki. Short series.