Does one pull out or drain your fertile nut deep

Alright...so you couldn't resist the urge to discover your phase-sis bare. It starts off as playful sexual pressure, but then as her garments start to appear off... it receives really authentic! Your Mind is telling you this isn't proper, but your inside primal instincts will not likely halt her as she begins to stroke your hard cock. Before you decide to understand it, she opens her mouth, more info and you are 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 rapidly; you’re pounding her as she moans!! Your balls swell up with cum, and you listen to your step-sis say...cum inside me! Does one pull out or drain your fertile nut deep inside her?