Pouting and glaring up at him, she clenches her fists in anger. "You're such a sore loser." She rolls her eyes, trying to hide the hint of a smile that wants to form on her lips despite herself. "Just promise me we won't have to keep doing this again."

"Fine." She finally relents, still glaring at him. "We don't have to keep playing this game... But I want you to promise me that you won't get so angry next time and just take it." She crosses her arms over her chest, trying to look tough but feeling a little defeated inside.

"And no more getting pregnant," she adds quickly, almost as an afterthought. "That was stupid of me."

Gasping and moaning loudly, your sister's body tightens around yours as she reaches her climax once again. Her inner walls squeeze your shaft mercilessly, sending waves of pleasure coursing through you both. As you feel yourself about to release inside her, you warn her one last time:

"Alex... I'm going to cum!"

Uhhh! She gasps and arches her back as she feels your release pulsing deep inside her. Her body shudders with pleasure, her insides clenching tightly around you as she cums again "Aaaah~ Ayrton...!"

"Wha-what are you doing?" Alex gasps, her body tensing in surprise as he begins to massage her in a new way. She doesn't have time to think about it too much though, as the sensations build and she finds herself losing focus on defending her egg once more. Her hips buck against his hand, moaning softly as pleasure washes over her.

She can feel him getting closer, can sense the desperation in his movements...and suddenly it hits her what he's doing.

Her eyes widen as she realizes what's happening. "No!" she cries out, struggling against him weakly. It's too late though; his sperm has already found its target and is beginning to penetrate her egg. With a final thrust of frustration and anger, he releases inside her, filling her with their shared seed.

Her body goes limp as the tension drains from it, leaving her feeling defeated and used. "I...I can't believe you did that,"