The Biting Kiss
The biting kiss is a more aggressive form of the French kiss. Like the French kiss, it's open-mouthed and incorporates tongue, but as you pull back, your teeth lightly grab onto your sweetie's tongue for just a second. Try it once and see how your partner responds. Some people love it, but others think it's painful or weird.

Fai has changed since becoming a vampire, and they both hate it.

Kurogane first notices the other man's eyes becoming the same gold as his hair, then come the fangs. Even the vampire's personality is drastically altered, or perhaps more accurately, he gives up on keeping up a fake mask and replaces the barriers he himself placed with reinforced steel, swearing not to make the same mistake he made before.

None of these changes particularly surprise Kurogane; he knew from the moment they met how much of a liar Fai was, and he understands that most of Fai's anger comes from fear and a painful yearning for death.

But one change he doesn't expect is Fai's new aggression. He supposes it's due to the new blood coursing through Fai's veins, blood that makes Fai amiable and quiet, caring only for the princess, and yet so fierce at night.

But Fai knows it's bitterness streaming through his veins that makes him act this way. It's hatred at the sight of Kurogane's crimson blood running down his wrists as the taller man insists on Fai feeding that causes the vampire to bite harder than he would normally, to relish the feeling of his teeth sinking slowly into Kurogane's flesh. The blood tastes metallic and Fai hates that he needs it now, that is forced for all eternity to rely on the man who did this to him. If only Kurogane had let him die when he was damn well supposed to.

Kurogane hates seeing Fai beneath him, eyes mere slits and lips sucking the blood from his veins. At times, he tries pulling Fai up to his level, putting them face to face. He draws the vampire into a kiss, hoping to quell the newly found temper with calmness. But a sharp bite as Kurogane slips in his tongue, holding it for a second, and the sight of the loathing in Fai's eyes is enough to make him push away. The vampire licks his lips, blood dripping from his chin, and Kurogane tastes the metal in his own mouth. Fai turns on his heel and slams the door shut as he leaves.

They both hate it, because they want to return to how it used to be.