Continuing the slow and gentle motion of his cock through the girl's soft cleavage, Jimmy did his best to just think of something else. Fucking his own sister's tits just wasn't happening, and despite the feeling of having his manhood caressed between those lovey hills he sternly held his own arousal in check, refusing to give in to his own lust.
"How long does it take?" He finally heard her soft voice call out to him from below, making him look down for a moment and stare into her pretty face. Just looking at her nearly made him lose it right away, and he was quick to look away again.
"What do you mean...?" He weakly tried to ask her, not sure he even wanted to know. He wasn't sure he wanted her to tell him to continue, and he certainly didn't want her to stop...
"For you to cum?" She giggled, pressing her own breasts a little harder together around his cock. "I thought it'd be pretty quick."
"Uh... I don't think that'd be a good idea..." He nervously grunted back, trying to push the images appearing before his eyes out of his head.
"Why not?" She queried, giggling again in a way that made her chest shudder pleasantly beneath him.
"I... I think it'd get kinda messy..." He mumbled, trying to dissuade her with at least half of the truth while daring another look down at her perplexed expression. "I mean... You could get it in your face and stuff..."
"Really...?" She wondered, for the first time looking at least a little bit uncertain. "Doesn't it just, you know... dribble out? Or just jump an inch or so?"
"No, no..." Jimmy grunted, wondering what sort of sexual education they were giving out in school. Considering it was a few weeks since last time he unloaded and the fact that his sister was most likely the hottest girl he'd been with since... well, ever actually... it was quite likely that he would shoot his seed like a freaking water-cannon. "It's... you know... an ejaculation. Sometimes it's just an inch, sometimes further..."
"Okay...?" Jenny nodded her head while wetting her lips and watching the cockhead popping up anddown through her cleavage with slight suspicion. Then a curious smile slowly formed on her lips again as she looked up to meet his eyes. "You know what, I don't think I care..."
"Jen..." He started, trying to come up with some way to talk her out of it, but was quickly cut off.
"No, I mean it!" She smiled, again wetting her lips while looking down at his manhood. "Just do it, wherever you want. Just let me see it!"
"What are you...? Sick?" He mumbled back, stopping his movements for a while and just staring down at his little sister. It certainly wasn't every day a girl asked to get a cumshot, and much more rarely so your own sister.
"Maybe..." She just giggled, looking up into his confused face with another mischivous smile on her lips. "Do you really find it that weird? Coming from a guy who's taken a liking to hump his sister's buttocks?"
"Fair enough..." Jimmy weakly replied, looking down at her for another few moments before letting out a coughed chuckle. Soon he was humping away at her bosom again with renewed vigor, this time looking right down into her pretty and smiling little face while giving in to his lust for her and quickly picking up the pace...
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