Some Modifications

With another snap of his fingers, John focused his power on her body, enhancing her breasts until they swelled to an impossible F-cup, the skin stretching taut and her nipples standing erect. Emily moaned around his cock, her body responding to his touch with a newfound sensitivity. He knew she would now be able to handle anything they threw at her.

Mike stepped back, his eyes wide with amazement as he took in the new landscape of his sister's body. He licked his lips, his cock already swelling again at the thought of what they could do with her now. John pulled out of her mouth, his cock slick with her spit, and looked at her with a twisted smile. "Let's see how well those new tits can handle your brother's cock," he said, gesturing to Mike.

Mike didn't need any further encouragement. He stepped forward, his cock aching with need as he squeezed her massive breasts together. Emily's eyes were glazed over with a mix of pain and pleasure, her new, oversized lips parted in a silent invitation. He slid his cock between her breasts, groaning as her flesh enveloped him. John watched with a critical eye, noticing that she was already adapting to the new size, her mouth moving to suck the head of his cock.

With a snap of his fingers, John focused on her mouth. Her lips swelled, becoming plumper and more sensitive, the skin around them tightening. Her tongue grew longer and more agile, and her jaw unlocked, giving her the ability to deep-throat without gagging. He knew that she would now be able to take them both, to satisfy their every need without breaking.

Emily's eyes widened slightly, as if she could feel the changes happening within her. She looked up at John with a mix of fear and excitement, her mouth watering. She didn't know what he had just done to her, but she could feel the difference. She was no longer just a slut; she was a living, breathing sex toy, designed for their pleasure.

Mike took full advantage of her enhanced abilities, pushing his cock deep between her tits. The feeling was like nothing he had ever experienced. Her new, oversized breasts engulfed him, the softness and warmth unlike any he had felt before. He groaned with pleasure as she began to bob her head, her elongated tongue wrapping around the shaft of his cock, stroking it in time with her titfucking.

Her eyes never left his, a silent communication that told him she was fully engaged, that she was here for his pleasure and his alone. The sight of his cock disappearing between her breasts, her swollen, sensitive lips stretched around the head, was too much to handle. He felt his orgasm building, his balls tightening as he watched her take him deeper and deeper, her cheeks hollowing with each stroke.

Mike's breath grew ragged as he felt his climax approaching. He had seen porn before, of course, but nothing had ever come close to this. The feeling of her mouth and breasts working in tandem was a sensation beyond his wildest dreams. He could feel the head of his cock brushing against the back of her throat, the tightness of her new jawline working him like a pro.

John watched with a mix of pride and arousal, his own hand stroking his cock as he took in the sight of his son fucking Emily's enhanced tits. He had never seen anything so depraved, and yet, it was beautiful in its own twisted way. Her eyes were locked onto Mike's, a silent communication of need and desire that sent a shiver down John's spine.

With a wicked smirk, John decided to take things up a notch. He snapped his fingers, and Mike's cock began to swell before his very eyes. It grew thicker, wider, longer, until it was a monstrous 4 inches thick and 18 inches long. Emily's eyes went wide with terror and excitement, her body trembling as she took in the new, terrifying size of her brother's manhood.

Mike looked down at himself, astonishment and fear mingling in his gaze. "What... what did you do?" he stuttered, his hand shaking as he touched his engorged shaft. The sensation was intense, almost painful, but the power it brought him was intoxicating.

John chuckled darkly. "I just made sure you could give her the fuck of her life," he said, his eyes gleaming with malice. "Go ahead, she can handle it."

Mike's fear was palpable, but so was his excitement. He had always felt like the lesser of the two, the one who couldn't measure up to his father's expectations. But now, with this new power, he could be the one in control. He lined up his massive cock with her gaping pussy, the tip brushing against the folds of her stretched, abused flesh.

Her eyes widened even more, the realization of what was about to happen setting in. But instead of resistance, she spread her legs wider, welcoming the challenge. Mike took a deep breath and pushed forward, feeling the tightness of her pussy stretching to accommodate his new size. She moaned, the sound a mix of agony and pleasure, as he buried himself to the hilt.

John stepped back, watching the scene unfold with a sadistic smile. The sight of his son's massive cock disappearing into her was mesmerizing, and he could feel his own arousal reaching new heights. He knew this was only the beginning, that they had so much more to explore with their newfound power.