Yes, with an orgasm

Sasuke leaned in closer, his eyes never leaving hers as he began to knead Kyubi's ample breasts, feeling her nipples pebble even more under his thumbs. "Because, my dear," he murmured, "I am searching for the finest vessels to carry on my legacy, the strongest wombs to bear the future Uchiha progeny." He paused, his voice dropping to a seductive rumble, "And you, Kyubi, with your boundless vitality and power, are one of those coveted wombs." His words were a blatant declaration of his intent, stripping away any pretense of romance or affection. Kyubi's smirk faltered, her breath hitching in her throat as she felt a strange mix of anger and arousal at his bluntness. "You would use me for breeding?" she asked, her voice a sultry challenge. Sasuke's eyes blazed with determination, his erection unwavering. "Not just use," he corrected, "but claim. To ensure that your next transformation is not into a mere copy, but the mother of my children." He leaned down, his breath hot against her skin as he whispered, "Will you be the one to carry the fire of my lineage?"

Her refusal died on her lips as Sasuke's Raiton technique sent a jolting electric current through her nipples. The sudden, intense sensation was like nothing Kyubi had ever felt before, and it set her entire body ablaze with pleasure. She couldn't help but arch her back and let out a scream that was part agony, part ecstasy. Her legs trembled and gave out, dropping her to her knees before the imposing Uchiha. She looked up at him, her eyes glazed with lust and surprise, her breathing ragged and erratic. The power surging through her from the orgasm was unparalleled, leaving her momentarily incapacitated. Sasuke's smirk grew into a full-fledged smile, his eyes gleaming with triumph as he watched the once-mighty demoness brought to her knees by his touch. "Is that what you wish?" he asked, his voice a seductive purr. "To be the one who carries the heirs of the Uchiha within you?" Kyubi's mind raced, the allure of his proposal mingling with the fear of losing herself. Yet, as the aftershocks of her climax subsided, she found herself nodding, unable to resist the tantalizing promise of power and legacy that he offered. "Y-yes," she gasped, her voice a mere whisper. "I'll bear your children." And with that, the terms of their agreement were sealed, the battle of wills shifting into a dance of seduction and domination.

With a victorious smile, Sasuke positioned his throbbing member before Kyubi's full, red lips. He watched as she stared up at him, a mix of desire and defiance in her eyes. He knew she was not one to be easily conquered, yet the way she licked her lips, as if tasting the promise of their union, told him she was ready to submit. "Now, prove your worth," he murmured, the tip of his cock grazing her cheek. Kyubi's smirk returned, and with a flick of her tongue, she tasted the salty precum that beaded on the tip. The electricity in the air grew stronger, a potent mix of chakra and lust. Her eyes never leaving his, she took him into her mouth, her lips sliding down the length of his shaft with surprising ease. Her mouth was hot and wet, a fiery cavern that seemed to swallow him whole. Sasuke's eyes rolled back in his head as she began to suck him with a fervor that was both thrilling and terrifying. The demoness had accepted his challenge, and he knew he was in for a wild ride.