Concerning Confirmation

John froze mid-thrust, a look of horror spreading across his face as a realization hit him like a ton of bricks. "I just... I came inside you," he said, his voice filled with panic.

Sarah looked at him, her eyes heavy-lidded with desire and confusion, thrusting lightly up at him. "Yes, you did," she said, her tone sultry. "And it felt incredible."

"Oh god, what if...what if you get pregnant?" John said, face going pale.

"Did you want me to get pregnant?" she asked with a shrug, her voice casual, as if asking if he wanted a glass of water.

"NO!" John exclaimed, practically shouting. He cursed himself for being so stupid and careless. "I could ruin your life!"

Sarah's looked up at her brother, a hint of amusement mixed with puzzlement in her eyes. "How would it ruin anything if I got pregnant? If you want a baby, I could do that, but obviously I'm not going to get pregnant unless that's how you want to use me."

John stared down at her, his confusion growing by the second. "What do you mean?" he asked, genuinely puzzled.

Sarah rolled her eyes, a hint of exasperation in her expression. "Of course you would only get me pregnant if you want to," she said, as if it were the most obvious thing in the world. "Come on, John. If I get pregnant my body will change. What if you wanted to fuck me, but didn't want to fuck me when I was pregnant? It wouldn't be right to change my body like that unless you were sure that's how you wanted to use me."

John's mind raced as he processed her words. Could it really be that simple? Could he just decide? Could he just cum inside his sister and never have to worry about it?

Before he could fully consider the implications, Sarah suddenly rolled them over, straddling him and sinking down onto his still-hard cock with a moan of pleasure, and began to ride him, her hips moving in a slow, sensual grind as she leaned forward, ensuring that her massive breasts were right in John's face.

"Now," she said, her voice husky with desire. "Are you done asking dumb questions and ready to continue using me? Where were we?"

John groaned as Sarah's tight pussy enveloped him once more, all thoughts of pregnancy and consequences fleeing his mind in an instant. He grabbed onto her hips, thrusting up to meet her descending cunt, two siblings lost in their own world of pleasure. John focused on the sensation of Sarah's pussy milking his cock, the sight of her bouncing tits, the sound of her moans of pleasure as she speared his dick into her. He looked down and watched his dick disappear and reappear with each movement. John put thoughts of accidental pregnancy out of his head, and focused on fucking his big sister. He felt the familiar pressure building in his balls once more, and with a loud groan, he began to cum inside Sarah for the second time. He watched in awe as she writhed on top of him, her tight pussy clenching around his spurting dick, milking every last drop from him, and watched his cum gush out of her, completely worry free.

Sarah slowly lifted herself off of John's still-hard cock with a wet squelch. As his dick came free, it slapped against his stomach, glistening with their combined juices. She took a moment to catch her breath, her chest heaving as she looked down at her brother with a satisfied smile.

"Was that how you wanted to use me?" she asked, her voice playful and slightly breathless.

John could only nod, still trying to regain his composure. He couldn't believe how amazing it felt to cum inside his sister's tight pussy, knowing he had filled her completely with his seed. TO be able to just cu in her with abandon. Sarah seemed to take his silence as a good sign, stretching languidly like a cat.

"Well," she said, her tone casual, "if you're done for now, I should probably get back to my homework."

John blinked at her in disbelief, still not used to how matter-of-fact Sarah was about this. It was as if she had simply taken a short break from studying to have sex with her brother, and now it was time to return to normal life.

John didn't reply, and Sarah slid off her bed, gathering her scattered clothes. John watched as Sarah bent over to retrieve her shirt, her large ass sticking out towards him in a way that made his still hard dick twitch with renewed desire. He knew he could just tell her to stay like that, to forget about homework and stand there as he walked up behind her and thrust himself back into her inviting pussy, slapped her firm ass... or maybe something else.