Does one pull out or drain your fertile nut deep

Okay...so You could not resist the urge to find out your step-sis naked. It starts off off as playful sexual tension, but then as her apparel start to arrive off... it will get very genuine! Your brain is telling you this isn't ideal, but your inner primal instincts won't cease her as she begins to stroke your hard cock. Before you realize it, she opens her mouth, and you're feeling her tongue around your tip... then her legs spread as she guides your throbbing meat into her swollen moist vagina. It’s all taking place so rapid; you’re pounding her as she moans!! Your balls swell up with cum, and you hear your stage-sis say...cum check here inside me! Do you pull out or drain your fertile nut deep inside of her?