John blinked a few times and looked at the cat ears. This couldn't possibly have happened from the vampire biting the troll. Maybe it had different effects on trolls. He extended out his hand. "J-JOHN WHAT ARE YOU DOING?" Karkat asked a little scared. John ignored him and stroked the ears; Karkat was a little surprised at first, but then started purring. "Now you're really like a cat!" He chuckled. Karkat stopped purring and looked up at John with a confused expression.
John picked up a hand mirror and handed it to Karkat. Taking hold of the mirror the troll looked at his reflection and was shocked, he stood. John was even more surprised to find that he had a cat tail to go with his black ears. The tail fluffed out and twitched from side to side. It hit something and fluffed out even more, Karkat looked at his backside towards it. "JOHN?" The cat-troll said slowly. "Yeah?" "WHAT THE FUCK DID YOU DO TO ME?!" He didn't really know himself; to be honest he kinda liked Karkat better with the ears and tail.
"Well, I guess when I bit you instead of turning into a vampire like me you got those." He points to the cat ears and tail. His ears drew back and his tail flicked back and forward, irritated. "WHY DID YOU BITE ME IN THE FIRST PLACE JOHN?!" John rubbed the back of his neck. "Well I kinda needed to in order for me to live." Karkat's ear flicked back up and his tail stopped, he looked up at John synthetically. "I-I DIDN'T KNOW, I'M SORRY…" His eyes darted to the ground. "No I'm sorry. I put you through this crap when I could've gotten the blood from a raw steak."
John was ashamed of himself, he did this to his boyfriend when he could've done that. Karkat smiles at him and gives him a forgiving look. The vampire blinks in confusion, but before he can say anything Karkat has his lips on John's.