She held him horizontally in her left hand, like a hot dog she was not allowed to nibble on, and stroked the top lightly with her index finger for a few moments before switching her attention to his ultra-sensitive helmet. She lightly tickled that with her finger tip, and his rate of hardening greatly increased. Once he was fairly firm, she wrapped her hand lightly around him and started stroking slowly while she fondled his balls with the other hand. He was quickly rock hard. Or so he thought.
"Well?" he asked a bit breathlessly.
"Hmmm, not completely hard yet," she said clinically.
Yeah, right, he thought, but he wasn't complaining.
Meanwhile, she stopped stroking for a moment and held out her hand. Her eyes flashed, a dollop of a creamy looking substance appeared on her palm, and she applied it to his cock, then started stroking again. He moaned at the incredible extra sensations the lubrication added to her stroking. He had to admit that he did grow a bit harder.
She stroked for a moment more, and then said in her clinical voice, "Completely hard now at just over ten inches." She didn't stop her slow stroking or ball fondling.
Ok..." he cleared his throat and tried again. "Ok, so that's a bit big for most women, yes."
"Most, yes," she said with a raised eyebrow.
He tried to concentrate. "Ok, let's try this: My cock stays at its current six inches while soft, but hardens to whatever size will give the woman in question the most pleasure. Obviously, it will never harden to anything less than six inches, though."
Tingle. "Done."
"But, it didn't change. I thought that the older new size was the ideal one for you."
She grinned. "This is, now," she said happily as she continued her long, slow strokes. She surely knew that it wasn't his original intention for her to masturbate him to orgasm right now, but was obviously ignoring that, enjoying teasing him a bit and thus not planning to stop until he expressly asked her to.
He was sorely tempted to tell her to blow him at that point, but this reminded him of his earlier blow job, and this in turn reminded him of his concern about taking what she could do for granted.
She sensed his more serious turn, and she looked at him expectantly while lightening her touch to a less distracting one. She still didn't stop, though. He had to smile. She grinned back. Both smiles faded slowly as he looked into her eyes, collecting his thoughts. She waited.