Need

Kurt rocked his hips downward and rubbed his growing erection against her tight bottom. He heard her moan and she tilted her head to the side, baring her neck. He pressed his mouth to the damp skin at her nape and gave her a sharp nip.
"Who's bluffing?" She gasped in a whisper. She, herself was surprised at her own actions and his response. He released her wrist tentatively and she slid her fingers into his hair. Kurt kneed her legs apart and settled himself more firmly against her. She brushed her buttocks against him again and brought one of her knees up to brace their combined weight. He slipped a hand beneath her and cupped her breast. It was confined in a tight-fitting sports bra. Impatient to feel more of her skin, he ripped the back of her shirt open with both hands. Then he used his teeth to assist in the rending of the offending lycra that bound her so tightly. He moved his thick fingers inside the back of her shirt and around to the front to fondle her breasts, now liberated from her activewear.
Kurt licked the blood that oozed from the fang marks he'd put in her shoulder and she hissed at the sensation; both pleasurable and painful. He moved one of his hands down her side and then beneath her belly to cup her heat. She made a whimpering sound and pushed impatiently at his hand. Feeling her need as keen as his own, he pulled down the back of her shorts and gripped her bare hip with his hand. She bit his arm again, but this time more playfully. Neither spoke, they were beyond verbal communication now. Kitty reached back and found the firm ridge between his legs. His blunt fingers moved inside her shorts and panties to stroke her intimately. She pushed her hand past the waistband of his pants and fumbled slightly before closing her grip around his hot flesh. She bucked back against him when he pressed his finger inside her moist passage.
Kurt nearly lost his mind when she gave his erection a few hard pumps. He rolled back on his heels and gasped for air. Kitty came up to her knees and looked him in the eye. Her expression was nothing short of feral, and he was afraid that he would be overwhelmed and hurt her. He'd already drawn blood from her, and he did not, as a rule, enjoy hurting women, even in battle. Kitty would not be disuaded from her goal, and Kurt doubted that he could resist her in his current state. He opened his mouth to say something to her when she crawled toward him on the mat. His words were lost when she moved her palms up his legs and pushed him onto his back. He looked at the ceiling of the danger room and tried to keep his mind focused. She pulled down the front of his sweatpants and freed his erection from the soft cloth.
"Mein Gott." He whispered as her lips closed around him. He clenched his hands into fists and glanced down. He saw her bottom sticking up in the air, and her dark head moving up and down slowly. She ran her tongue up his length and swirled it around the engorged head. Then she began to suck and he was lost in a sensation that had his blood singing through his veins and his head spinning. She sucked and caressed and licked and kissed. Kurt thought he would go mad. This wasn't the Kitty he knew, and he briefly wondered if it wasn't some kind of trick.