Takes it in her mouth

Cat didn't hesitate for a second. She rammed her lips over his thick cock, barely noticing the pain from her over-stretched jaw muscles. Her insatiable lust gave her no choice - she needed him. She needed more. She always needed more.

Tom let out a shuddering gasp as his sister pushed her hot mouth further over his helmet - slowly, but not for want of trying. Her hands caressed his orange-sized balls, as she struggled to breathe with the huge member blocking her mouth. Desperate for more, but unable to take it, her blue eyes shot to his, primal and desperate, her desire clear.

Tom didn't even think before complying. He grabbed her head in his hands, and forced her deeper onto his cock, spearing down her throat, feeling the structure of her mouth yielding before him. As Cat choked, she never lost his eyes, staring up at him with unconcealed ecstasy, struggling to suck and lick the huge shaft inside her. Tom wasn't about to stop, though, as he began to lift his sister's head off his cock, before bucking his hips and ramming back in again, giving her the face-fuck of a lifetime. Under the sound of water pelting their unified bodies, a muffled gok-gok-gok could be heard from somewhere behind Cat's lips. Her blue irises darted around wildly, eyelids fluttering, as Tom increased her arousal to reach her mind's limit. Finally, as he brutally face-fucked her at a relentless speed, he felt his huge balls releasing their load.

A torrent of cum erupted at the back of Cat's mouth, and she desperately tried to swallow it all - but it was far too much. Some of it burst past the seal her lips had made against her brother's magnificent shaft, whilst the rest was forced down her throat - some leaking out of her nose, only to be washed away in the shower. Then, just as she thought she would pass out, she came. It was a colossal orgasm; earth-shattering; mind-destroying. Every part of her mind shut down, utterly blinded by the inconceivable amount of pleasure that exploded from every atom in her body.

Though Tom could sense what she was experiencing, Cat didn't make a sound. Her eyes rolled right back into her head, and she slid off his cock to collapse on the wet floor, twitching, a broad smile on her cum-stained face. Panting, Tom looked down at his unconscious sister, sprawled amongst his sodden clothes, spunk oozing from her mouth and nose.

I could get used to this, Tom thought.