Does one pull out or drain your fertile nut deep

Okay...so You could not resist the urge to check out your stage-sis bare. It begins off as playful sexual rigidity, but then as her clothing begin to occur off... it receives quite real! Your brain is telling you this isn't ideal, but your inner primal instincts won't stop her as she starts to stroke your challenging cock. Before you realize it, she opens her mouth, and you feel her tongue close to your suggestion... then her legs distribute as she guides your throbbing meat into her swollen moist vagina. It’s all happening so quick; you’re pounding her as she moans!! Your balls swell up with cum, and you hear more info your step-sis say...cum within me! Would you pull out or drain your fertile nut deep inside her?