*giving Zero her blood, so he'll live longer, without his permission?
yes basically x She wants Zero to live as long as he can but she knows she can't ask or thinks she can't because Living as a vampire is a 'curse' to Zero. when she explains this to him in the latest chapter he basically says he will stay alive as long as he can be with her and then they are lovey dovey (≧∀≦) hope that helped!
Thanks, its a bit dark that she'd do that without his consent while knowing it's wrong but glad he gave her consent and they'll be lovey dovey for a while longer.
Wait, I've been skipping chapters, but was Yuuki giving Zero her blood without his permission? That's why she did it when he was asleep?