Do you pull out or drain your fertile nut deep

Ok...so you couldn't resist the urge to view your phase-sis bare. It starts off as playful sexual stress, but then as her clothes start to appear off... it receives extremely serious! Your brain is telling you this is not proper, but your interior primal instincts will not likely prevent her as she starts to stroke your really hard cock. Before you decide to realize it, she opens her mouth, and you feel her tongue close to your suggestion... then her legs here spread as she guides your throbbing meat into her swollen wet vagina. It’s all taking place so quickly; you’re pounding her as she moans!! Your balls swell up with cum, so you hear your step-sis say...cum inside me! Does one pull out or drain your fertile nut deep inside her?