Does one pull out or drain your fertile nut deep

Okay...so You could not resist the urge to see your action-sis naked. It begins off as playful sexual rigidity, but then as her clothing begin to occur off... it gets quite serious! Your brain is telling you this isn't right, but your inner primal instincts will not end her as she begins to stroke your difficult cock. Before you decide to understand it, she opens her mouth, and you are feeling her tongue about your suggestion... then her legs unfold as she guides your throbbing meat into her swollen damp vagina. It’s all going on so fast; you’re pounding her as sex clips she moans!! Your balls swell up with cum, and you also hear your phase-sis say...cum within me! Would you pull out or drain your fertile nut deep within her?