Does one pull out or drain your fertile nut deep

Alright...so You could not resist the urge to check out 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 is not going to prevent her as she begins to stroke your really hard cock. Before you realize it, she opens her mouth, and you're feeling her tongue all over your idea... then her legs distribute more info as she guides your throbbing meat into her swollen wet vagina. It’s all happening so rapidly; you’re pounding her as she moans!! Your balls swell up with cum, and you simply listen to your step-sis say...cum inside me! Do you pull out or drain your fertile nut deep inside her?