Do you pull out or drain your fertile nut deep

Ok...so You could not resist the urge to check out your action-sis bare. It starts off as playful sexual pressure, but then as her clothes start to appear off... it receives very true! Your Mind is telling you this is not right, but your inner primal instincts won't cease her as she starts to stroke your really hard cock. Before you know it, she opens her mouth, and you're feeling her tongue all around your idea... then her legs distribute as she guides your throbbing meat into her swollen soaked vagina. It’s all going on so quick; you’re pounding her as she moans!! Your balls swell up with cum, so you hear your phase-sis say...cum within me! Would you pull more info out or drain your fertile nut deep within her?