Zero has a bad dream about Yuuki(something about loosing her) in the nurse's room and wakes up to her looking at him with a worried expression. His first impulse is to kiss her but stops when she askes what's wrong. With this we settle the "kissing" scene from the trailer.

Third: the blood is a result of her memories from ten years ago trying to surface, something similar happening when she goes with Zero and Chairman to the vampire association to investigate about her long lost memories. The book about the events from that time starts to burn on it's own

Forth: Yuuki becomes Kaname's lover in exchange for him to tell her about her past, because he wants proof that she will not hate him (the night before this, when she tries to ask, he confesses his love for her) but she sais that she could never hate him

5th: because of various events involving Rido Kuran and events that happened 10 years ago, Kaname decides to bite Yuuki awakening her vampire side (this is something like a kiss, because he uses his mouth to give her his blood). As expected, Zero gets furious and points his gun at Kaname for "turning" Yuuki into a vampire only for her to shield Kaname and say that he is her brother, and then fainting.
Zero is shocked, but Kaname replies that he would have been happier if that was true.

Later on we find out that Yuuki is Juri and Haruka Kuran's daughter making her Kaname's sister. The only problem is that her brother's soul was killed shortly after his birth by Rido and Kaname placed in him, making Kaname unable to kill Rido. Even if they knew this, Haruka and Juri (who were actually sibilings themselves) raised and loved him like a son, giving birth to Yuuki so she would become his bride.
Anyway, kaname wants to take her away from the academy, but she said she will never forgive him if he forces her. (This is where the second kiss takes place) Yuuki kisses him and says "I will definitely return to onii-sama's arms"

The rest is a little heartbreaking for all the Zero fans...

Zero has a bad dream about Yuuki(something about loosing her) in the nurse's room and wakes up to her looking at him with a worried expression. His first impulse is to kiss her but stops when she askes what's wrong. With this we settle the "kissing" scene from the trailer.

Third: the blood is a result of her memories from ten years ago trying to surface, something similar happening when she goes with Zero and Chairman to the vampire association to investigate about her long lost memories. The book about the events from that time starts to burn on it's own

Forth: Yuuki becomes Kaname's lover in exchange for him to tell her about her past, because he wants proof that she will not hate him (the night before this, when she tries to ask, he confesses his love for her) but she sais that she could never hate him

5th: because of various events involving Rido Kuran and events that happened 10 years ago, Kaname decides to bite Yuuki awakening her vampire side (this is something like a kiss, because he uses his mouth to give her his blood). As expected, Zero gets furious and points his gun at Kaname for "turning" Yuuki into a vampire only for her to shield Kaname and say that he is her brother, and then fainting.
Zero is shocked, but Kaname replies that he would have been happier if that was true.

Later on we find out that Yuuki is Juri and Haruka Kuran's daughter making her Kaname's sister. The only problem is that her brother's soul was killed shortly after his birth by Rido and Kaname placed in him, making Kaname unable to kill Rido. Even if they knew this, Haruka and Juri (who were actually sibilings themselves) raised and loved him like a son, giving birth to Yuuki so she would become his bride.
Anyway, kaname wants to take her away from the academy, but she said she will never forgive him if he forces her. (This is where the second kiss takes place) Yuuki kisses him and says "I will definitely return to onii-sama's arms"

The rest is a little heartbreaking for all the Zero fans...