There is a lot of mentions of blood, and some suggestions of gory scenes. There is also some mentions of Kurt cumming in his pants and stuff. 

If any of that makes you uncomfortable, don't read the vampire chapters.

***

Kurt had been turned into a vampire soon after getting captured and forced into the Munich Circles. The people who owned him injected him with vampire venom thinking that being bloodthirsty would add to the feeling that he was some sort of demon, and make crowds want to pay more money to see a real life demon from hell. His hunger was usually kept under control with the blood of animals, which wasn't very satisfying to Kurt, but it kept him fed. However, a few days, sometimes a whole week, before Kurt was scheduled to fight, his owners would starve him, so that when he was released into the cage, more often than not he ended up biting his opponent and drinking their blood. 

Kurt learned very quickly that the longer a vampire goes without drinking any blood, the more and more feral they become. One time, Kurt's owners starved him for weeks, so when he was put in the cage with another mutant, the fight ended very quickly, and it ended with Kurt coming draining his opent of their blood until they were within and inch of their life. Needless to say, Kurt was very relieved when the X-Men saved him. 

The only downside to being taken to the X Mansion was that none of the X-Men seemed to know that Kurt was a vampire. Or if they did, they were intentionally starving him. Kurt wasn't sure exactly why no one was providing him with any blood, or even telling him where he could get some for himself, but he was growing more and more dangerous each day. It got to the point where Kurt had to barricaded himself inside of the room he was given in order to keep the other's away from him, because the last thing he wanted was to hurt anyone else again, or even worse, end up killing someone. 

Unfortunately, after a while of Kurt not leaving his room at all, the X-Men grew concerned, and they had Logan go and force his way into Kurt's room, and past his barricades to check on him. When Logan entered Kurt's room, he was surprised to find the whole place trashed, but even more surprised to find Kurt crouched down on the ground, backed into a corner, and hissing angrily at Logan like an animal. 

"Kurt?" Logan asked, confused, stepping a bit closer. The closer Logan got to Kurt, the stronger his scent became, and as much as Kurt wanted to hold back, he was very, very hungry, and he was slipping out of a competent state of mind. 

"Stay away!" Kurt growled, teleporting to the otherside of the room, as far away from Logan as he could get. "It's not safe!" 

"Are you having a panic attack?" Logan asked, not seeming to understand the situation as he started walking over to Kurt again. "Just take a few deep breaths, and focus on what's actually going on around you. You're safe, and you'll be ok."

Logan was just too close for Kurt to hold back anymore, and he lunged at the man, clinging to his chest, and sinking his teeth into the crook of Logan's neck. Kurt felt nothing but relief, and satisfaction when he finally tasted blood in his mouth again. He sucked roughly on the wound he had made, and even bit Logan again, very close to the original bite mark, trying to get as much blood out of the man as he could. However, much to Kurt's dismay, the bite marks he would make in Logan's skin would heal themselves rapidly, meaning Kurt had to just keep biting him. But before Kurt was able to drink enough to even begin to feel satisfied, Logan managed to yank Kurt away from his neck. 

"What the hell are you doing?!" Logan yelled angrily, but Kurt wasn't paying attention to anything he was saying. All he could focus on was how there was still some blood left on Logan's neck, and he wanted it. Kurt hissed at Logan, blood dripping from his mouth as he squirmed in Logan's hold in an effort to get back to his neck. 

"Kurt, what's wrong with you?" Logan shook Kurt a little bit, and the man came back to his senses enough to start crying, wracked with guilt. 

"I'm sorry." Kurt sobbed. "I can't help it. I'm just so hungry."

"What do you mean?" Logan looked concerned and confused, and Kurt winced, struggling to stay himself. 

"You need to get away before i bite you again. I could kill you." 

"It's going to be ok." Logan hugged Kurt close to him in an effort to comfort the man, but all he did was make Kurt lose himself to the hunger again and bite Logan. 

Kurt drank Logan's blood eagurely, continuously biting the man as his skin kept fusing itself back together again. Kurt lost himself in the feeling of biting down on Logan with his sensitive teeth over and over again, his mouth flooding with delicious blood every time, and it wasn't long before Kurt started to grind his hardening crotch against Logan's body. Kurt couldn't really help it, he was delirious, and his vampire fangs were one of the biggest erogenous zones he had, and because they were so sensitive, he ended cumming in his pants most times he bit somebody, and biting Logan was no different. 

Eventually Kurt had drank enough of Logan's blood to put himself in the right state of mind, and he pulled completely away from Logan, his pants sticky, and his face and shirt covered in blood. Kurt was ashamed, and he couldn't stop crying, and he couldn't look up from his feet, afraid to see how Logan was looking at him.

"Kurt? Are you ok?" Logan asked, his voice nothing but concern, and Kurt just nodded, unable to speak. "Let's sit down and you can explain to me what just happened." 

Logan gently took one of Kurt's hands and lead him over to Kurt's bed, both of them sitting down to talk. 

"I'm a vampire. I wasn't sure if you guys knew that or not, but I can see now that you weren't starving me on purpose." Kurt explained, still crying. 

"Well of course we weren't trying to starve you. Why didn't you say anything before?"

"I was worried you guys would be mad. But if I don't get enough blood regularly, I become feral. That's why I barricaded my room, to keep you guys safe. And that's why I bit you and drank so much of your blood. I couldn't help it. I'm really sorry." 

"It's ok, I heal very quickly, and I understand. Can I ask you something though? Is it normal for me to be so turned on?"

"Yeah. I thinks it's something in my saliva, or something, I'm not sure, but it makes drinking someone's blood kind of an....intimate action." 

"Oh. Well, look, until we figure something else out, you have my permission to come bit me and drink my blood whenever you need too. Even everyday if that's what you need. I have super healing, so it won't hurt me."

"Thank you Logan. That's very kind."